.\Get-ExchangeEnvironmentReport  -HTMLReport c:\report.html

.\Get-ExchangeEnvironmentReport  -HTMLReport c:\report.html -SendMail:$true -MailFrom:you@example.com -MailTo:you@example.com -MailServer:smtp.example.com

.\Get-ExchangeEnvironmentReport  -HTMLReport c:\report.html -SendMail:$true -MailFrom:you@example.com -MailTo:you@example.com -MailServer:smtp.example.com -ScheduleAs:DOMAIN\user

<#
    .SYNOPSIS
    Creates a HTML Report describing the Exchange environment
   
    Steve Goodman
   
    THIS CODE IS MADE AVAILABLE AS IS, WITHOUT WARRANTY OF ANY KIND. THE ENTIRE
    RISK OF THE USE OR THE RESULTS FROM THE USE OF THIS CODE REMAINS WITH THE USER.
   
    Version 1.5.4, 17th August 2011
   
    .DESCRIPTION
   
    This script creates a HTML report showing the following information about an Exchange 2010
    and to a lesser extent, 2007 and 2003, environment. The following is shown:
   
    * Report Generation Time
    * Total Servers per Exchange Version (2003 > 2010)
    * Total Mailboxes per Exchange Version and Organisation
    * Total Roles in the environment
       
    Then, per site:
    * Total Mailboxes per site
    * Exchange Servers with:
        o Exchange Server Version
        o Service Pack
        o Update Rollup and rollup version
        o Roles installed on server and mailbox counts
        o OS Version and Service Pack
       
    Then, per Database availability group (Exchange 2010):
    * Total members per DAG
    * Member list
    * Databases, detailing:
        o Mailbox Count and Average Size
        o Archive Mailbox Count and Average Size (Only shown if DAG includes Archive Mailboxes)
        o Database Size and whitespace
        o Database and log disk free
        o Last Full Backup (Only shown if one or more DAG database has been backed up)
        o Circular Logging Enabled (Only shown if one or more DAG database has Circular Logging enabled)
        o Mailbox server hosting active copy
        o List of mailbox servers hosting copies and number of copies
       
    Finally, per Database (Non DAG DBs/Exchange 2007/Exchange 2003)
    * Databases, detailing:
        o Storage Group (if applicable) and DB name
        o Server hosting database
        o Mailbox Count and Average Size
        o Archive Mailbox Count and Average Size (Only shown if DAG includes Archive Mailboxes)
        o Database Size and whitespace
        o Database and log disk free
        o Last Full Backup (Only shown if one or more DAG database has been backed up)
        o Circular Logging Enabled (Only shown if one or more DAG database has Circular Logging enabled)
       
    This does not detail public folder infrastructure, or examine Exchange 2007/2003 CCR/SCC clusters
    (although it attempts to detect Clustered Exchange 2007/2003 servers, signified by ClusMBX).
   
    IMPORTANT NOTE: The script requires WMI and Remote Registry access to Exchange servers from the server
    it is run from to determine OS version, Update Rollup, Exchange 2007/2003 cluster and DB size information.
   
    .PARAMETER HTMLReport
    Filename to write HTML Report to
   
    .PARAMETER SendMail
    Send Mail after completion. Set to $True to enable. If enabled, -MailFrom, -MailTo, -MailServer are mandatory
   
    .PARAMETER MailFrom
    Email address to send from. Passed directly to Send-MailMessage as -From
   
    .PARAMETER MailTo
    Email address to send to. Passed directly to Send-MailMessage as -To
   
    .PARAMETER MailServer
    SMTP Mail server to attempt to send through. Passed directly to Send-MailMessage as -SmtpServer
   
    .PARAMETER ScheduleAs
    Attempt to schedule the command just executed for 10PM nightly. Specify the username here, schtasks (under the hood) will ask for a password later.
   
    .PARAMETER ViewEntireForest
    By default, true. Set the option in Exchange 2007 or 2010 to view all Exchange servers and recipients in the forest.
   
    .PARAMETER ServerFilter
    Use a text based string to filter Exchange Servers by, e.g. NL-* -  Note the use of the wildcard (*) character to allow for multiple matches.
   
    .EXAMPLE
    Generate the HTML report
    .\Get-ExchangeEnvironmentReport.ps1 -HTMLReport .\report.html
   
    #>
param(
    [parameter(Position=0,Mandatory=$true,ValueFromPipeline=$false,HelpMessage='Filename to write HTML report to')][string]$HTMLReport,
    [parameter(Position=1,Mandatory=$false,ValueFromPipeline=$false,HelpMessage='Send Mail ($True/$False)')][bool]$SendMail=$false,
    [parameter(Position=2,Mandatory=$false,ValueFromPipeline=$false,HelpMessage='Mail From')][string]$MailFrom,
    [parameter(Position=3,Mandatory=$false,ValueFromPipeline=$false,HelpMessage='Mail To')]$MailTo,
    [parameter(Position=4,Mandatory=$false,ValueFromPipeline=$false,HelpMessage='Mail Server')][string]$MailServer,
    [parameter(Position=4,Mandatory=$false,ValueFromPipeline=$false,HelpMessage='Schedule as user')][string]$ScheduleAs,
    [parameter(Position=5,Mandatory=$false,ValueFromPipeline=$false,HelpMessage='Change view to entire forest')][bool]$ViewEntireForest=$true,
    [parameter(Position=5,Mandatory=$false,ValueFromPipeline=$false,HelpMessage='Server Name Filter (eg NL-*)')][string]$ServerFilter="*"
    )

# Sub-Function to Get Database Information. Shorter than expected..
function _GetDAG
{
    param($DAG)
    @{Name          = $DAG.Name.ToUpper()
      MemberCount   = $DAG.Servers.Count
      Members       = [array]($DAG.Servers | % { $_.Name })
      Databases     = @()
      }
}


# Sub-Function to Get Database Information
function _GetDB
{
    param($Database,$ExchangeEnvironment,$Mailboxes,$ArchiveMailboxes,$E2010)
   
    # Circular Logging, Last Full Backup
    if ($Database.CircularLoggingEnabled) { $CircularLoggingEnabled="Yes" } else { $CircularLoggingEnabled = "No" }
    if ($Database.LastFullBackup) { $LastFullBackup=$Database.LastFullBackup.ToString() } else { $LastFullBackup = "Not Available" }
   
    # Mailbox Average Sizes
    $MailboxStatistics = [array]($ExchangeEnvironment.Servers[$Database.Server.Name].MailboxStatistics | Where {$_.Database -eq $Database.Identity})
    if ($MailboxStatistics)
    {
        [long]$MailboxItemSizeB = 0
        $MailboxStatistics | %{ $MailboxItemSizeB+=$_.TotalItemSizeB }
        [long]$MailboxAverageSize = $MailboxItemSizeB / $MailboxStatistics.Count
    } else {
        $MailboxAverageSize = 0
    }
   
    # Free Disk Space Percentage
    if ($ExchangeEnvironment.Servers[$Database.Server.Name].Disks)
    {
        foreach ($Disk in $ExchangeEnvironment.Servers[$Database.Server.Name].Disks)
        {
            if ($Database.EdbFilePath.PathName -like "$($Disk.Name)*")
            {
                $FreeDatabaseDiskSpace = $Disk.FreeSpace / $Disk.Capacity * 100
            }
            if ($Database.ExchangeVersion.ExchangeBuild.Major -ge 14)
            {
                if ($Database.LogFolderPath.PathName -like "$($Disk.Name)*")
                {
                    $FreeLogDiskSpace = $Disk.FreeSpace / $Disk.Capacity * 100
                }
            } else {
                $StorageGroupDN = $Database.DistinguishedName.Replace("CN=$($Database.Name),","")
                $Adsi=[adsi]"LDAP://$($Database.OriginatingServer)/$($StorageGroupDN)"
                if ($Adsi.msExchESEParamLogFilePath -like "$($Disk.Name)*")
                {
                    $FreeLogDiskSpace = $Disk.FreeSpace / $Disk.Capacity * 100
                }
            }
        }
    } else {
        $FreeLogDiskSpace=$null
        $FreeDatabaseDiskSpace=$null
    }
   
    if ($Database.ExchangeVersion.ExchangeBuild.Major -ge 14 -and $E2010)
    {
        # Exchange 2010 Database Only
        $CopyCount = [int]$Database.Servers.Count
        if ($Database.MasterServerOrAvailabilityGroup.Name -ne $Database.Server.Name)
        {
            $Copies = [array]($Database.Servers | % { $_.Name })
        } else {
            $Copies = @()
        }
        # Archive Info
        $ArchiveMailboxCount = [int]([array]($ArchiveMailboxes | Where {$_.ArchiveDatabase -eq $Database.Name})).Count
        $ArchiveStatistics = [array]($ArchiveMailboxes | Where {$_.ArchiveDatabase -eq $Database.Name} | Get-MailboxStatistics -Archive )
        if ($ArchiveStatistics)
        {
            [long]$ArchiveItemSizeB = 0
            $ArchiveStatistics | %{ $ArchiveItemSizeB+=$_.TotalItemSize.Value.ToBytes() }
            [long]$ArchiveAverageSize = $ArchiveItemSizeB / $ArchiveStatistics.Count
        } else {
            $ArchiveAverageSize = 0
        }
        # DB Size / Whitespace Info
        [long]$Size = $Database.DatabaseSize.ToBytes()
        [long]$Whitespace = $Database.AvailableNewMailboxSpace.ToBytes()
        $StorageGroup = $null
       
    } else {
        $ArchiveMailboxCount = 0
        $CopyCount = 0
        $Copies = @()
        # 2003 & 2007, Use WMI (Based on code by Gary Siepser, http://bit.ly/kWWMb3)
        $Size = [long](get-wmiobject cim_datafile -computername $Database.Server.Name -filter ('name=''' + $Database.edbfilepath.pathname.replace("\","\\") + '''')).filesize
        if (!$Size)
        {
            Write-Warning "Cannot detect database size via WMI for $($Database.Server.Name)"
            [long]$Size = 0
            [long]$Whitespace = 0
        } else {
            [long]$MailboxDeletedItemSizeB = 0
            if ($MailboxStatistics)
            {
                $MailboxStatistics | %{ $MailboxDeletedItemSizeB+=$_.TotalDeletedItemSizeB }
            }
            $Whitespace = $Size - $MailboxItemSizeB - $MailboxDeletedItemSizeB
            if ($Whitespace -lt 0) { $Whitespace = 0 }
        }
        $StorageGroup =$Database.DistinguishedName.Split(",")[1].Replace("CN=","")
    }
   
    @{Name                      = $Database.Name
      StorageGroup              = $StorageGroup
      ActiveOwner               = $Database.Server.Name.ToUpper()
      MailboxCount              = [long]([array]($Mailboxes | Where {$_.Database -eq $Database.Identity})).Count
      MailboxAverageSize        = $MailboxAverageSize
      ArchiveMailboxCount       = $ArchiveMailboxCount
      ArchiveAverageSize        = $ArchiveAverageSize
      CircularLoggingEnabled    = $CircularLoggingEnabled
      LastFullBackup            = $LastFullBackup
      Size                      = $Size
      Whitespace                = $Whitespace
      Copies                    = $Copies
      CopyCount                 = $CopyCount
      FreeLogDiskSpace          = $FreeLogDiskSpace
      FreeDatabaseDiskSpace     = $FreeDatabaseDiskSpace
      }
}


# Sub-Function to get mailbox count per server.
# New in 1.5.2
function _GetExSvrMailboxCount
{
    param($Mailboxes,$ExchangeServer,$Databases)
    # The following *should* work, but it doesn't. Apparently, ServerName is not always returned correctly which may be the cause of
    # reports of counts being incorrect
    #([array]($Mailboxes | Where {$_.ServerName -eq $ExchangeServer.Name})).Count
   
    # ..So as a workaround, I'm going to check what databases are assigned to each server and then get the mailbox counts on a per-
    # database basis and return the resulting total. As we already have this information resident in memory it should be cheap, just
    # not as quick.
    $MailboxCount = 0
    foreach ($Database in [array]($Databases | Where {$_.Server -eq $ExchangeServer.Name}))
    {
        $MailboxCount+=([array]($Mailboxes | Where {$_.Database -eq $Database.Identity})).Count
    }
    $MailboxCount
   
}

# Sub-Function to Get Exchange Server information
function _GetExSvr
{
    param($E2010,$ExchangeServer,$Mailboxes,$Databases)
   
    # Set Basic Variables
    $MailboxCount = 0
    $RollupLevel = 0
    $RollupVersion = ""
   
    # Get WMI Information
    $tWMI = Get-WmiObject Win32_OperatingSystem -ComputerName $ExchangeServer.Name -ErrorAction SilentlyContinue
    if ($tWMI)
    {
        $OSVersion = $tWMI.Caption.Replace("(R)","").Replace("Microsoft ","").Replace("Enterprise","Ent").Replace("Standard","Std").Replace(" Edition","")
        $OSServicePack = $tWMI.CSDVersion
        $RealName = $tWMI.CSName.ToUpper()
    } else {
        Write-Warning "Cannot detect OS information via WMI for $($ExchangeServer.Name)"
        $OSVersion = "N/A"
        $OSServicePack = "N/A"
        $RealName = $ExchangeServer.Name.ToUpper()
    }
    $tWMI=Get-WmiObject -query "Select * from Win32_Volume" -ComputerName $ExchangeServer.Name -ErrorAction SilentlyContinue
    if ($tWMI)
    {
        $Disks=$tWMI | Select Name,Capacity,FreeSpace | Sort-Object -Property Name
    } else {
        Write-Warning "Cannot detect OS information via WMI for $($ExchangeServer.Name)"
        $Disks=$null
    }
   
    # Get Exchange Version
    if ($ExchangeServer.AdminDisplayVersion.Major -eq 6)
    {
        $ExchangeMajorVersion = "$($ExchangeServer.AdminDisplayVersion.Major).$($ExchangeServer.AdminDisplayVersion.Minor)"
        $ExchangeSPLevel = $ExchangeServer.AdminDisplayVersion.FilePatchLevelDescription.Replace("Service Pack ","")
    } else {
        $ExchangeMajorVersion = $ExchangeServer.AdminDisplayVersion.Major
        $ExchangeSPLevel = $ExchangeServer.AdminDisplayVersion.Minor
    }
    # Exchange 2007+
    if ($ExchangeMajorVersion -ge 8)
    {
        # Get Roles
        $MailboxStatistics=$null
        [array]$Roles = $ExchangeServer.ServerRole.ToString().Replace(" ","").Split(",");
        if ($Roles -contains "Mailbox")
        {
            $MailboxCount = _GetExSvrMailboxCount -Mailboxes $Mailboxes -ExchangeServer $ExchangeServer -Databases $Databases
            if ($ExchangeServer.Name.ToUpper() -ne $RealName)
            {
                $Roles = [array]($Roles | Where {$_ -ne "Mailbox"})
                $Roles += "ClusteredMailbox"
            }
            # Get Mailbox Statistics the normal way, return in a consitent format
            $MailboxStatistics = Get-MailboxStatistics -Server $ExchangeServer | Select DisplayName,@{Name="TotalItemSizeB";Expression={$_.TotalItemSize.Value.ToBytes()}},@{Name="TotalDeletedItemSizeB";Expression={$_.TotalDeletedItemSize.Value.ToBytes()}},Database
        }
        # Rollup Level / Versions (Thanks to Bhargav Shukla http://bit.ly/msxGIJ)
        if ($ExchangeMajorVersion -eq 14)
        {
            $RegKey="SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\UserData\\S-1-5-18\\Products\\AE1D439464EB1B8488741FFA028E291C\\Patches"
        } else {
            $RegKey="SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\UserData\\S-1-5-18\\Products\\461C2B4266EDEF444B864AD6D9E5B613\\Patches"
        }
        $RemoteRegistry = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $ExchangeServer.Name);
        if ($RemoteRegistry)
        {
            $RUKeys= $RemoteRegistry.OpenSubKey($RegKey).GetSubKeyNames() | ForEach {"$RegKey\\$_"}
            if ($RUKeys)
            {
                [array]($RUKeys | %{$RemoteRegistry.OpenSubKey($_).getvalue("DisplayName")}) | %{
                    if ($_ -like "Update Rollup *")
                    {
                        $tRU = $_.Split(" ")[2]
                        if ($tRU -like "*-*") { $tRUV=$tRU.Split("-")[1]; $tRU=$tRU.Split("-")[0] } else { $tRUV="" }
                        if ($tRU -ge $RollupLevel) { $RollupLevel=$tRU; $RollupVersion=$tRUV }
                    }
                }
            }
        } else {
            Write-Warning "Cannot detect Rollup Version via Remote Registry for $($ExchangeServer.Name)"
        }
       
    }
    # Exchange 2003
    if ($ExchangeMajorVersion -eq 6.5)
    {
        # Mailbox Count
        $MailboxCount = _GetExSvrMailboxCount -Mailboxes $Mailboxes -ExchangeServer $ExchangeServer -Databases $Databases
        # Get Role via WMI
        $tWMI = Get-WMIObject Exchange_Server -Namespace "root\microsoftexchangev2" -Computername $ExchangeServer.Name -Filter "Name='$($ExchangeServer.Name)'"
        if ($tWMI)
        {
            if ($tWMI.IsFrontEndServer) { $Roles=@("FE") } else { $Roles=@("BE") }
        } else {
            Write-Warning "Cannot detect Front End/Back End Server information via WMI for $($ExchangeServer.Name)"
            $Roles+="Unknown"
        }
        # Get Mailbox Statistics using WMI, return in a consistent format
        $tWMI = Get-WMIObject -class Exchange_Mailbox -Namespace ROOT\MicrosoftExchangev2 -ComputerName $ExchangeServer.Name -Filter ("ServerName='$($ExchangeServer.Name)'")
        if ($tWMI)
        {
            $MailboxStatistics = $tWMI | Select @{Name="DisplayName";Expression={$_.MailboxDisplayName}},@{Name="TotalItemSizeB";Expression={$_.Size}},@{Name="TotalDeletedItemSizeB";Expression={$_.DeletedMessageSizeExtended }},@{Name="Database";Expression={((get-mailboxdatabase -Identity "$($_.ServerName)\$($_.StorageGroupName)\$($_.StoreName)").identity)}}
        } else {
            Write-Warning "Cannot retrieve Mailbox Statistics via WMI for $($ExchangeServer.Name)"
            $MailboxStatistics = $null
        }
    }  
    # Exchange 2000
    if ($ExchangeMajorVersion -eq "6.0")
    {
        # Mailbox Count
        $MailboxCount = _GetExSvrMailboxCount -Mailboxes $Mailboxes -ExchangeServer $ExchangeServer -Databases $Databases
        # Get Role via ADSI
        $tADSI=[ADSI]"LDAP://$($ExchangeServer.OriginatingServer)/$($ExchangeServer.DistinguishedName)"
        if ($tADSI)
        {
            if ($tADSI.ServerRole -eq 1) { $Roles=@("FE") } else { $Roles=@("BE") }
        } else {
            Write-Warning "Cannot detect Front End/Back End Server information via ADSI for $($ExchangeServer.Name)"
            $Roles+="Unknown"
        }
        $MailboxStatistics = $null
    }
   
    # Return Hashtable
    @{Name                  = $ExchangeServer.Name.ToUpper()
     RealName               = $RealName
     ExchangeMajorVersion   = $ExchangeMajorVersion
     ExchangeSPLevel        = $ExchangeSPLevel
     Edition                = $ExchangeServer.Edition
     Mailboxes              = $MailboxCount
     OSVersion              = $OSVersion;
     OSServicePack          = $OSServicePack
     Roles                  = $Roles
     RollupLevel            = $RollupLevel
     RollupVersion          = $RollupVersion
     Site                   = $ExchangeServer.Site.Name
     MailboxStatistics      = $MailboxStatistics
     Disks                  = $Disks
    }  
}

# Sub Function to Get Totals by Version
function _TotalsByVersion
{
    param($ExchangeEnvironment)
    $TotalMailboxesByVersion=@{}
    if ($ExchangeEnvironment.Sites)
    {
        foreach ($Site in $ExchangeEnvironment.Sites.GetEnumerator())
        {
            foreach ($Server in $Site.Value)
            {
                if (!$TotalMailboxesByVersion["$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)"])
                {
                    $TotalMailboxesByVersion.Add("$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)",@{ServerCount=1;MailboxCount=$Server.Mailboxes})
                } else {
                    $TotalMailboxesByVersion["$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)"].ServerCount++
                    $TotalMailboxesByVersion["$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)"].MailboxCount+=$Server.Mailboxes
                }
            }
        }
    }
    if ($ExchangeEnvironment.Pre2007)
    {
        foreach ($FakeSite in $ExchangeEnvironment.Pre2007.GetEnumerator())
        {
            foreach ($Server in $FakeSite.Value)
            {
                if (!$TotalMailboxesByVersion["$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)"])
                {
                    $TotalMailboxesByVersion.Add("$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)",@{ServerCount=1;MailboxCount=$Server.Mailboxes})
                } else {
                    $TotalMailboxesByVersion["$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)"].ServerCount++
                    $TotalMailboxesByVersion["$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)"].MailboxCount+=$Server.Mailboxes
                }
            }
        }
    }
    $TotalMailboxesByVersion
}

# Sub Function to Get Totals by Role
function _TotalsByRole
{
    param($ExchangeEnvironment)
    # Add Roles We Always Show
    $TotalServersByRole=@{"ClientAccess"     = 0
                          "HubTransport"     = 0
                          "UnifiedMessaging" = 0
                          "Mailbox"          = 0
                          "Edge"             = 0
                          }
    if ($ExchangeEnvironment.Sites)
    {
        foreach ($Site in $ExchangeEnvironment.Sites.GetEnumerator())
        {
            foreach ($Server in $Site.Value)
            {
                foreach ($Role in $Server.Roles)
                {
                    if ($TotalServersByRole[$Role] -eq $null)
                    {
                        $TotalServersByRole.Add($Role,1)
                    } else {
                        $TotalServersByRole[$Role]++
                    }
                }
            }
        }
    }
    if ($ExchangeEnvironment.Pre2007["Pre 2007 Servers"])
    {
       
        foreach ($Server in $ExchangeEnvironment.Pre2007["Pre 2007 Servers"])
        {
           
            foreach ($Role in $Server.Roles)
            {
                if ($TotalServersByRole[$Role] -eq $null)
                {
                    $TotalServersByRole.Add($Role,1)
                } else {
                    $TotalServersByRole[$Role]++
                }
            }
        }
    }
    $TotalServersByRole
}

# Sub Function to return HTML Table for Sites/Pre 2007
function _GetOverview
{
    param($Servers,$ExchangeEnvironment,$ExRoleStrings,$Pre2007=$False)
    if ($Pre2007)
    {
        $BGColHeader="#880099"
        $BGColSubHeader="#8800CC"
        $Prefix=""
    } else {
        $BGColHeader="#000099"
        $BGColSubHeader="#0000FF"
        $Prefix="Site:"
    }
    $Output="<table border=""0"" cellpadding=""3"" width=""100%"" style=""font-size:8pt;font-family:Arial,sans-serif"">
    <col width=""20%""><col width=""20%"">
    <colgroup width=""25%"">";
   
    #$Output+="<col width=""4%""><col width=""4%""><col width=""3%""><col width=""3%""><col width=""3%""><col width=""3%"">";
    $ExchangeEnvironment.TotalServersByRole.GetEnumerator()|Sort Name| %{$Output+="<col width=""3%"">"}
    $Output+="</colgroup><col width=""20%""><col  width=""20%"">
    <tr bgcolor=""$($BGColHeader)""><th><font color=""#ffffff"">$($Prefix) $($Servers.Key)</font></th>
    <th><font color=""#ffffff"">Exchange Version</font></th>
    <th colspan=""$($ExchangeEnvironment.TotalServersByRole.Count)""><font color=""#ffffff"">Roles Installed</font></th>
    <th><font color=""#ffffff"">OS Version</font></th>
    <th><font color=""#ffffff"">OS Service Pack</font></th></tr>"
    $TotalMailboxes=0
    $Servers.Value | %{$TotalMailboxes += $_.Mailboxes}
    $Output+="<tr bgcolor=""$($BGColSubHeader)""><th><font color=""#ffffff"">Mailboxes: $($TotalMailboxes)</font></th><th></th>"
    $ExchangeEnvironment.TotalServersByRole.GetEnumerator()|Sort Name| %{$Output+="<th><font color=""#ffffff"">$($ExRoleStrings[$_.Key].Short)</font></th>"}
    $Output+="<th></th><th></th></tr>"
    $AlternateRow=0
   
    foreach ($Server in $Servers.Value)
    {
        $Output+="<tr "
        if ($AlternateRow)
        {
            $Output+=" style=""background-color:#dddddd"""
            $AlternateRow=0
        } else
        {
            $AlternateRow=1
        }
        $Output+="><td>$($Server.Name)"
        if ($Server.RealName -ne $Server.Name)
        {
            $Output+=" ($($Server.RealName))"
        }
        $Output+="</td>
        <td>$($ExVersionStrings["$($Server.ExchangeMajorVersion).$($Server.ExchangeSPLevel)"].Long)"
        if ($Server.RollupLevel -gt 0)
        {
            $Output+=" UR$($Server.RollupLevel)"
            if ($Server.RollupVersion)
            {
                $Output+=" $($Server.RollupVersion)"
            }
        }
        $Output+="</td>"
        $ExchangeEnvironment.TotalServersByRole.GetEnumerator()|Sort Name| %{
            $Output+="<td"
            if ($Server.Roles -contains $_.Key)
            {
                $Output+=" align=""center"" style=""background-color:#00FF00"""
            }
            $Output+=">"
            if (($_.Key -eq "ClusteredMailbox" -or $_.Key -eq "Mailbox" -or $_.Key -eq "BE") -and $Server.Roles -contains $_.Key)
            {
                $Output+=$Server.Mailboxes
            }
        }
               
        $Output+="<td>$($Server.OSVersion)</td><td>$($Server.OSServicePack)</td></tr>";
    }
    $Output+="<tr></tr>
    </table><br />"
    $Output
}

# Sub Function to return HTML Table for Databases
function _GetDBTable
{
    param($Databases)
    # Only Show Archive Mailbox Columns, Backup Columns and Circ Logging if at least one DB has an Archive mailbox, backed up or Cir Log enabled.
    $ShowArchiveDBs=$False
    $ShowLastFullBackup=$False
    $ShowCircularLogging=$False
    $ShowStorageGroups=$False
    $ShowCopies=$False
    $ShowFreeDatabaseSpace=$False
    $ShowFreeLogDiskSpace=$False
    foreach ($Database in $Databases)
    {
        if ($Database.ArchiveMailboxCount -gt 0)
        {
            $ShowArchiveDBs=$True
        }
        if ($Database.LastFullBackup -ne "Not Available")
        {
            $ShowLastFullBackup=$True
        }
        if ($Database.CircularLoggingEnabled -eq "Yes")
        {
            $ShowCircularLogging=$True
        }
        if ($Database.StorageGroup)
        {
            $ShowStorageGroups=$True
        }
        if ($Database.CopyCount -gt 0)
        {
            $ShowCopies=$True
        }
        if ($Database.FreeDatabaseDiskSpace -ne $null)
        {
            $ShowFreeDatabaseSpace=$true
        }
        if ($Database.FreeLogDiskSpace -ne $null)
        {
            $ShowFreeLogDiskSpace=$true
        }
    }
   
   
    $Output="<table border=""0"" cellpadding=""3"" width=""100%"" style=""font-size:8pt;font-family:Arial,sans-serif"">
   
    <tr align=""center"" bgcolor=""#FFD700"">
    <th>Server</th>"
    if ($ShowStorageGroups)
    {
        $Output+="<th>Storage Group</th>"
    }
    $Output+="<th>Database Name</th>
    <th>Mailboxes</th>
    <th>Av. Mailbox Size</th>"
    if ($ShowArchiveDBs)
    {
        $Output+="<th>Archive MBs</th><th>Av. Archive Size</th>"
    }
    $Output+="<th>DB Size</th><th>DB Whitespace</th>"
    if ($ShowFreeDatabaseSpace)
    {
        $Output+="<th>Database Disk Free</th>"
    }
    if ($ShowFreeLogDiskSpace)
    {
        $Output+="<th>Log Disk Free</th>"
    }
    if ($ShowLastFullBackup)
    {
        $Output+="<th>Last Full Backup</th>"
    }
    if ($ShowCircularLogging)
    {
        $Output+="<th>Circular Logging</th>"
    }
    if ($ShowCopies)
    {
        $Output+="<th>Copies (n)</th>"
    }
   
    $Output+="</tr>"
    $AlternateRow=0;
    foreach ($Database in $Databases)
    {
        $Output+="<tr"
        if ($AlternateRow)
        {
            $Output+=" style=""background-color:#dddddd"""
            $AlternateRow=0
        } else
        {
            $AlternateRow=1
        }
       
        $Output+="><td>$($Database.ActiveOwner)</td>"
        if ($ShowStorageGroups)
        {
            $Output+="<td>$($Database.StorageGroup)</td>"
        }
        $Output+="<td>$($Database.Name)</td>
        <td align=""center"">$($Database.MailboxCount)</td>
        <td align=""center"">$("{0:N2}" -f ($Database.MailboxAverageSize/1MB)) MB</td>"
        if ($ShowArchiveDBs)
        {
            $Output+="<td align=""center"">$($Database.ArchiveMailboxCount)</td>
            <td align=""center"">$("{0:N2}" -f ($Database.ArchiveAverageSize/1MB)) MB</td>";
        }
        $Output+="<td align=""center"">$("{0:N2}" -f ($Database.Size/1GB)) GB </td>
        <td align=""center"">$("{0:N2}" -f ($Database.Whitespace/1GB)) GB</td>";
        if ($ShowFreeDatabaseSpace)
        {
            $Output+="<td align=""center"">$("{0:N1}" -f $Database.FreeDatabaseDiskSpace)%</td>"
        }
        if ($ShowFreeLogDiskSpace)
        {
            $Output+="<td align=""center"">$("{0:N1}" -f $Database.FreeLogDiskSpace)%</td>"
        }
        if ($ShowLastFullBackup)
        {
            $Output+="<td align=""center"">$($Database.LastFullBackup)</td>";
        }
        if ($ShowCircularLogging)
        {
            $Output+="<td align=""center"">$($Database.CircularLoggingEnabled)</td>";
        }
        if ($ShowCopies)
        {
            $Output+="<td>$($Database.Copies|%{$_}) ($($Database.CopyCount))</td>"
        }
        $Output+="</tr>";
    }
    $Output+="</table><br />"
   
    $Output
}


# Sub Function to neatly update progress
function _UpProg1
{
    param($PercentComplete,$Status,$Stage)
    $TotalStages=5
    Write-Progress -id 1 -activity "Get-ExchangeEnvironmentReport" -status $Status -percentComplete (($PercentComplete/$TotalStages)+(1/$TotalStages*$Stage*100))
}

# 1. Initial Startup

# 1.0 Check Powershell Version
if ((Get-Host).Version.Major -eq 1)
{
    throw "Powershell Version 1 not supported";
}

# 1.1 Check Exchange Management Shell, attempt to load
if (!(Get-Command Get-ExchangeServer -ErrorAction SilentlyContinue))
{
    if (Test-Path "C:\Program Files\Microsoft\Exchange Server\V14\bin\RemoteExchange.ps1")
    {
        . 'C:\Program Files\Microsoft\Exchange Server\V14\bin\RemoteExchange.ps1'
        Connect-ExchangeServer -auto
    } elseif (Test-Path "C:\Program Files\Microsoft\Exchange Server\bin\Exchange.ps1") {
        Add-PSSnapIn Microsoft.Exchange.Management.PowerShell.Admin
        .'C:\Program Files\Microsoft\Exchange Server\bin\Exchange.ps1'
    } else {
        throw "Exchange Management Shell cannot be loaded"
    }
}

# 1.2 Check if -SendMail parameter set and if so check -MailFrom, -MailTo and -MailServer are set
if ($SendMail)
{
    if (!$MailFrom -or !$MailTo -or !$MailServer)
    {
        throw "If -SendMail specified, you must also specify -MailFrom, -MailTo and -MailServer"
    }
}

# 1.3 Check Exchange Management Shell Version
if ((Get-PSSnapin -Name Microsoft.Exchange.Management.PowerShell.Admin -ErrorAction SilentlyContinue))
{
    $E2010 = $false;
    if (Get-ExchangeServer | Where {$_.AdminDisplayVersion.Major -eq 14})
    {
        Write-Warning "Exchange 2010 detected. You'll get better results if you run this script from an Exchange 2010 management shell"
    }
}else{
    $E2010 = $true
}

# 1.4 Check view entire forest if set (by default, true)
if ($E2010)
{
    Set-ADServerSettings -ViewEntireForest:$ViewEntireForest
} else {
    $global:AdminSessionADSettings.ViewEntireForest = $ViewEntireForest
}

# 1.5 Initial Variables

# 1.5.1 Hashtable to update with environment data
$ExchangeEnvironment = @{Sites                  = @{}
                         Pre2007                = @{}
                         Servers                = @{}
                         DAGs                   = @()
                         NonDAGDatabases        = @()
                        }
# 1.5.7 Exchange Major Version String Mapping
$ExMajorVersionStrings = @{"6.0" = @{Long="Exchange 2000";Short="E2000"}
                           "6.5" = @{Long="Exchange 2003";Short="E2003"}
                           "8"   = @{Long="Exchange 2007";Short="E2007"}
                           "14"  = @{Long="Exchange 2010";Short="E2010"}}
# 1.5.8 Exchange Service Pack String Mapping
$ExSPLevelStrings = @{"0" = "RTM"
                      "1" = "SP1"
                      "2" = "SP2"
                      "3" = "SP3"
                      "4" = "SP4"}
# 1.5.9 Populate Full Mapping using above info
$ExVersionStrings = @{}
foreach ($Major in $ExMajorVersionStrings.GetEnumerator())
{
    foreach ($Minor in $ExSPLevelStrings.GetEnumerator())
    {
        $ExVersionStrings.Add("$($Major.Key).$($Minor.Key)",@{Long="$($Major.Value.Long) $($Minor.Value)";Short="$($Major.Value.Short)$($Minor.Value)"})
    }
}
# 1.5.10 Exchange Role String Mapping
$ExRoleStrings = @{"ClusteredMailbox" = @{Short="ClusMBX";Long="CCR/SCC Clustered Mailbox"}
                   "Mailbox"          = @{Short="MBX";Long="Mailbox"}
                   "ClientAccess"     = @{Short="CAS";Long="Client Access"}
                   "HubTransport"     = @{Short="HUB";Long="Hub Transport"}
                   "UnifiedMessaging" = @{Short="UM";Long="Unified Messaging"}
                   "Edge"             = @{Short="EDGE";Long="Edge Transport"}
                   "FE"           = @{Short="FE";Long="Front End"}
                   "BE"           = @{Short="BE";Long="Back End"}
                   "Unknown"      = @{Short="Unknown";Long="Unknown"}}

# 2 Get Relevant Exchange Information Up-Front

# 2.1 Get Server, Exchange and Mailbox Information
_UpProg1 1 "Getting Exchange Server List" 1
$ExchangeServers = [array](Get-ExchangeServer $ServerFilter)
if (!$ExchangeServers)
{
    throw "No Exchange Servers matched by -ServerFilter ""$($ServerFilter)"""
}

_UpProg1 10 "Getting Mailboxes" 1
$Mailboxes = [array](Get-Mailbox -ResultSize Unlimited) | Where {$_.Server -like $ServerFilter}
if ($E2010)
{
    _UpProg1 60 "Getting Archive Mailboxes" 1
    $ArchiveMailboxes = [array](Get-Mailbox -Archive -ResultSize Unlimited) | Where {$_.Server -like $ServerFilter}
    _UpProg1 90 "Getting Databases" 1
    $Databases = [array](Get-MailboxDatabase -IncludePreExchange2010 -Status)  | Where {$_.Server -like $ServerFilter}
    $DAGs = [array](Get-DatabaseAvailabilityGroup) | Where {$_.Servers -like $ServerFilter}
} else {
    $ArchiveMailboxes = $null
    $ArchiveMailboxStats = $null   
    $DAGs = $null
    _UpProg1 90 "Getting Databases" 1
    $Databases = [array](Get-MailboxDatabase -IncludePreExchange2007 -Status) | Where {$_.Server -like $ServerFilter}
}

# 2.3 Populate Information we know
$ExchangeEnvironment.Add("TotalMailboxes",$Mailboxes.Count);

# 3 Process High-Level Exchange Information

# 3.1 Collect Exchange Server Information
for ($i=0; $i -lt $ExchangeServers.Count; $i++)
{
    _UpProg1 ($i/$ExchangeServers.Count*100) "Getting Exchange Server Information" 2
    # Get Exchange Info
    $ExSvr = _GetExSvr -E2010 $E2010 -ExchangeServer $ExchangeServers[$i] -Mailboxes $Mailboxes -Databases $Databases
    # Add to site or pre-Exchange 2007 list
    if ($ExSvr.Site)
    {
        # Exchange 2007 or higher
        if (!$ExchangeEnvironment.Sites[$ExSvr.Site])
        {
            $ExchangeEnvironment.Sites.Add($ExSvr.Site,@($ExSvr))
        } else {
            $ExchangeEnvironment.Sites[$ExSvr.Site]+=$ExSvr
        }
    } else {
        # Exchange 2003 or lower
        if (!$ExchangeEnvironment.Pre2007["Pre 2007 Servers"])
        {
            $ExchangeEnvironment.Pre2007.Add("Pre 2007 Servers",@($ExSvr))
        } else {
            $ExchangeEnvironment.Pre2007["Pre 2007 Servers"]+=$ExSvr
        }
    }
    # Add to Servers List
    $ExchangeEnvironment.Servers.Add($ExSvr.Name,$ExSvr)
}

# 3.2 Calculate Environment Totals for Version/Role using collected data
_UpProg1 1 "Getting Totals" 3
$ExchangeEnvironment.Add("TotalMailboxesByVersion",(_TotalsByVersion -ExchangeEnvironment $ExchangeEnvironment))
$ExchangeEnvironment.Add("TotalServersByRole",(_TotalsByRole -ExchangeEnvironment $ExchangeEnvironment))

# 3.4 Populate Environment DAGs
_UpProg1 5 "Getting DAG Info" 3
if ($DAGs)
{
    foreach($DAG in $DAGs)
    {
        $ExchangeEnvironment.DAGs+=(_GetDAG -DAG $DAG)
    }
}

# 3.5 Get Database information
_UpProg1 60 "Getting Database Info" 3
for ($i=0; $i -lt $Databases.Count; $i++)
{
    $Database = _GetDB -Database $Databases[$i] -ExchangeEnvironment $ExchangeEnvironment -Mailboxes $Mailboxes -ArchiveMailboxes $ArchiveMailboxes -E2010 $E2010
    $DAGDB = $false
    for ($j=0; $j -lt $ExchangeEnvironment.DAGs.Count; $j++)
    {
        if ($ExchangeEnvironment.DAGs[$j].Members -contains $Database.ActiveOwner)
        {
            $DAGDB=$true
            $ExchangeEnvironment.DAGs[$j].Databases += $Database
        }
    }
    if (!$DAGDB)
    {
        $ExchangeEnvironment.NonDAGDatabases += $Database
    }
   
   
}

# 4 Write Information
_UpProg1 5 "Writing HTML Report Header" 4
# Header
$Output="<html>
<body>
<font size=""1"" face=""Arial,sans-serif"">
<h3 align=""center"">Exchange Environment Report</h3>
<h5 align=""center"">Generated $((Get-Date).ToString())</h5>
</font>
<table border=""0"" cellpadding=""3"" style=""font-size:8pt;font-family:Arial,sans-serif"">
<tr bgcolor=""#009900"">
<th colspan=""$($ExchangeEnvironment.TotalMailboxesByVersion.Count)""><font color=""#ffffff"">Total Servers:</font></th>
<th colspan=""$($ExchangeEnvironment.TotalMailboxesByVersion.Count+1)""><font color=""#ffffff"">Total Mailboxes:</font></th>
<th colspan=""$($ExchangeEnvironment.TotalServersByRole.Count)""><font color=""#ffffff"">Total Roles:</font></th></tr>
<tr bgcolor=""#00CC00"">"
# Show Column Headings based on the Exchange versions we have
$ExchangeEnvironment.TotalMailboxesByVersion.GetEnumerator()|Sort Name| %{$Output+="<th>$($ExVersionStrings[$_.Key].Short)</th>"}
$ExchangeEnvironment.TotalMailboxesByVersion.GetEnumerator()|Sort Name| %{$Output+="<th>$($ExVersionStrings[$_.Key].Short)</th>"}
$Output+="<th>Org</th>"
$ExchangeEnvironment.TotalServersByRole.GetEnumerator()|Sort Name| %{$Output+="<th>$($ExRoleStrings[$_.Key].Short)</th>"}
$Output+="<tr>"
$Output+="<tr align=""center"" bgcolor=""#dddddd"">"
$ExchangeEnvironment.TotalMailboxesByVersion.GetEnumerator()|Sort Name| %{$Output+="<td>$($_.Value.ServerCount)</td>" }
$ExchangeEnvironment.TotalMailboxesByVersion.GetEnumerator()|Sort Name| %{$Output+="<td>$($_.Value.MailboxCount)</td>" }
$Output+="<td>$($ExchangeEnvironment.TotalMailboxes)</td>"
$ExchangeEnvironment.TotalServersByRole.GetEnumerator()|Sort Name| %{$Output+="<td>$($_.Value)</td>"}
$Output+="</tr><tr><tr></table><br>"

# Sites and Servers
_UpProg1 20 "Writing HTML Site Information" 4
foreach ($Site in $ExchangeEnvironment.Sites.GetEnumerator())
{
    $Output+=_GetOverview -Servers $Site -ExchangeEnvironment $ExchangeEnvironment -ExRoleStrings $ExRoleStrings
}
_UpProg1 40 "Writing HTML Pre-2007 Information" 4
foreach ($FakeSite in $ExchangeEnvironment.Pre2007.GetEnumerator())
{
    $Output+=_GetOverview -Servers $FakeSite -ExchangeEnvironment $ExchangeEnvironment -ExRoleStrings $ExRoleStrings -Pre2007:$true
}

_UpProg1 60 "Writing HTML DAG Information" 4
foreach ($DAG in $ExchangeEnvironment.DAGs)
{
    if ($DAG.MemberCount -gt 0)
    {
        # Database Availability Group Header
        $Output+="<table border=""0"" cellpadding=""3"" width=""100%"" style=""font-size:8pt;font-family:Arial,sans-serif"">
        <col width=""20%""><col width=""10%""><col width=""70%"">
        <tr align=""center"" bgcolor=""#FF8000 ""><th>Database Availability Group Name</th><th>Member Count</th>
        <th>Database Availability Group Members</th></tr>
        <tr><td>$($DAG.Name)</td><td align=""center"">
        $($DAG.MemberCount)</td><td>"
        $DAG.Members | % { $Output+="$($_) " }
        $Output+="</td></tr></table>"
       
        # Get Table HTML
        $Output+=_GetDBTable -Databases $DAG.Databases
    }
   
}

if ($ExchangeEnvironment.NonDAGDatabases.Count)
{
    _UpProg1 80 "Writing HTML Non-DAG Database Information" 4
    $Output+="<table border=""0"" cellpadding=""3"" width=""100%"" style=""font-size:8pt;font-family:Arial,sans-serif"">
          <tr bgcolor=""#FF8000""><th>Mailbox Databases (Non-DAG)</th></table>"
    $Output+=_GetDBTable -Databases $ExchangeEnvironment.NonDAGDatabases
}


# End
_UpProg1 90 "Finishing off.." 4
$Output+="</body></html>";
$Output | Out-File $HTMLReport


if ($SendMail)
{
    _UpProg1 95 "Sending mail message.." 4
    Send-MailMessage -Attachments $HTMLReport -To $MailTo -From $MailFrom -Subject "Exchange Environment Report" -BodyAsHtml $Output -SmtpServer $MailServer
}

if ($ScheduleAs)
{
    _UpProg1 99 "Attempting to Schedule Task.." 4
    $dir=(split-path -parent $myinvocation.mycommand.definition)
    $params="-HTMLReport $HTMLReport"
    if ($SendMail)
    {
        $params+=' -SendMail:$true'
        $params+=" -MailFrom:$MailFrom -MailTo:$MailTo -MailServer:$MailServer"
    }
    $task = "powershell -c \""pushd $dir; $($myinvocation.mycommand.definition) $params\"""
    Write-Output "Attempting to schedule task as $($ScheduleAs)..."
    Write-Output "Task to schedule: $($task)"
    schtasks /Create /RU $ScheduleAs /RP /SC DAILY /ST 22:00 /TN EER /TR $task
}