#msexchange #powershell
How cr@p am I? I totally forgot about this baby. So this is rough and ready 
not had a chance to sort the help out at the beginning, but I’m sure you will get the idea. Basically run this with one of the switches ByMailboxSize or ByMailboxCount and it will look at your exchange 2010 mailboxes and try and load balance the users. It doesn’t actually DO anything, what it will do is generate a CSV that you use as input for Move-RequestFromCSV that is here: http://flaphead.dns2go.com/?p=2945
Let me know what you think. In the test I have done so far ByMailboxCount is shweet, ByMailboxSize isn’t perfect. Enjoy
PARAM([String]$Database="", [String]$BatchName, [Switch]$ByMailboxCount, [Switch]$ByMailboxSize, [String]$SizePercentage=2, [String]$ExportCSV="$pwdmiguserlist.csv")
#http://stackoverflow.com/questions/5863772/powershell-round-down-to-nearest-whole-number
function round( $value, [MidpointRounding]$mode = ‘AwayFromZero’ ) { [Math]::Round( $value, $mode ) }
#$DB=@();Get-MailboxDatabase * | ForEach{$db += $_.name}
$xPsCheck = Get-PSSnapin | Select Name | Where {$_.Name -Like "*Exchange*"}
If ($xPsCheck -eq $Null) {Add-PsSnapin Microsoft.Exchange.Management.PowerShell.e2010}
Write-Host "Database:……."$Database
Write-Host "ByMailboxCount:."$ByMailboxCount
Write-Host "ByMailboxSize:.."$ByMailboxSize
Write-Host "SizePercentage:."$SizePercentage
Write-Host "ExportCSV:……"$ExportCSV
Write-Host ""
If ($Database -ne ""){
$tmpDatabaseArray = $database.split(" ")
$i=0
$DatabaseHashTable = @{}
ForEach($item in $tmpDatabaseArray){; $DatabaseHashTable.Add($i,$item); $i++}
}
$tmpDatabaseArray
$MailboxArray=@()
ForEach($item in $tmpDatabaseArray){
Write-Host "`nChecking Database" $item -Foregroundcolor Green
$position=$host.ui.rawui.cursorposition
$tmpMailbox = Get-Mailbox -Database $item -ResultSize unlimited
$mbxcnt = 0
$mbxItems = 0
$mbxSize = 0
ForEach($xMailbox in $tmpMailbox){
$tmpUser = $xmailbox.PrimarySmtpAddress.toString()
$host.ui.rawui.cursorposition=$position;
Write-Host "-" $tmpuser " "
$tmpMailboxArray = "" | Select DisplayName, Email, ServerName, Database, Items, Size, Target, Status
$tmpMailboxArray.DisplayName = $xMailbox.DisplayName
$tmpMailboxArray.Email = $tmpUser
$tmpMailboxArray.ServerName = $xMailbox.ServerName
$tmpMailboxArray.Database = $xMailbox.Database
$tmpMailboxArray.Target = $xMailbox.Database
$tmpMailboxStatistics = Get-Mailbox $tmpUser | Get-MailboxStatistics
$tmpMailboxArray.Items = $tmpMailboxStatistics.ItemCount
$tmpMailboxArray.Size = $tmpMailboxStatistics.TotalItemSize.Value.ToMB()
$MailboxArray += $tmpMailboxArray
$mbxcnt ++
$mbxItems += $tmpMailboxArray.Items
$mbxSize += $tmpMailboxArray.Size
}
$host.ui.rawui.cursorposition=$position;
Write-Host "-> Complete! " -NoNewLIne
Write-Host $mbxcnt -NoNewLine -ForegroundColor Yellow
Write-Host " Mailboxes Found with " -NoNewline
Write-Host $mbxItems -NoNewLine -ForegroundColor Yellow
Write-host " Items and " -NoNewLine
Write-Host $mbxSize -ForegroundColor Yellow -NoNewLine
Write-Host "MB "
}
#Okay lets count the number of databases
$DatabaseCount = $tmpdatabasearray.count
$MailboxCount = $MailboxArray.count
$MailboxSize = ($MailboxArray | Measure-Object Size -sum).Sum
$MailboxesPerDatabase = round ($MailboxCount / $DatabaseCount )
$MBPerDatabase = round ($MailboxSize / $DatabaseCount )
Write-Host "Database Count:……………."$DatabaseCount
Write-Host "Mailbox Count:…………….."$MailboxCount
Write-Host "Ideal Mailboxes Per Database:.."$MailboxesPerDatabase
Write-Host "Total Size:……………….."$MailboxSize
Write-Host "Ideal MB Per Database:………"$MBPerDatabase
$MBPerDatabase = round ($MBPerDatabase + (($MBPerDatabase /100)*$SizePercentage))
Write-Host "`nMB Per Database (+"$SizePercentage"%) = "$MBPerDatabase
#Group MailboxArray by Database
$DatabaseCountArray = $MailboxArray | Group Database
$DatabaseMatrix = @()
ForEach($Item in $DatabaseCountArray){
$tmpDatabaseMatrix = "" | Select Name, Count, Difference1, Difference2, MB , Difference3, Difference4
$tmpDatabaseMatrix.Name = $Item.Name
$tmpDatabaseMatrix.Count = $Item.Count
$tmpDatabaseMatrix.Difference1 = $MailboxesPerDatabase – $Item.Count
$tmpDatabaseMatrix.Difference2 = $Item.Count – $MailboxesPerDatabase
$tmpDatabaseMatrix.MB  
; = ($Item.Group | Measure-Object Size -Sum).Sum
$tmpDatabaseMatrix.Difference3 = $MBPerDatabase – $tmpDatabaseMatrix.MB
$tmpDatabaseMatrix.Difference4 = $tmpDatabaseMatrix.MB – $MBPerDatabase
$DatabaseMatrix += $tmpDatabaseMatrix
}
$DatabaseMatrix | ft
If ($ByMailboxSize){
Write-Host "`nBY MAILBOX SIZE" -Foregroundcolor Red
Write-Host "—————"
Write-Host "`nFinding databases with excess mailboxes"
$Database2MoveOff = $DatabaseMatrix | Where {$_.Difference4 -ge 0}
ForEach($db in $Database2MoveOff){
Write-Host $db.Name -Foregroundcolor Blue
$tmpExcess = $MailboxArray | where {$_.Database -eq $db.Name} | Sort Size -Descending
$targetMB=0
ForEach($yUser in $MailboxArray | where {$_.Database -eq $db.Name} | Sort Size -Descending){
$tmpMB = $yUser.Size
If ($tmpMB + $targetMB -gt $MBPerDatabase){
$yUser.Target = ""
} ELSE {
$yuser.Status = "Keep"
$targetMB += $tmpMB
} #If ($tmpMB + $targetMB -gt $MBPerDatabase)
} #ForEach $yUser
} #ForEach $db
Write-Host "`nAssigning excess mailboxes"
ForEach($item in $DatabaseMatrix | Where {$_.Difference3 -gt 0}){
$Mailboxes2Move = $DatabaseMatrix | Where {$_.Target -eq ""}
$targetMB=$item.MB
ForEach($yUser in $MailboxArray | where {$_.Target -eq ""} | Sort Size -Descending){
$tmpMB = $yUser.Size
If ($tmpMB + $targetMB -gt $MBPerDatabase){
$yUser.Target = ""
} ELSE {
$yuser.Target = $item.Name
$yuser.Status = "Move"
$targetMB += $tmpMB
} #If ($tmpMB + $targetMB -gt $MBPerDatabase)
} #ForEach $yUser
} #ForEach $item
Write-Host "`nSUMMARY" -Foregroundcolor Green
Write-Host "Ideal MB Per Database:………"$MBPerDatabase
$MailboxArray | Group Target | %{
New-Object psobject -Property @{
Item = $_.Name
Sum = ($_.Group | Measure-Object Size -Sum).Sum
}
}
} #If ($ByMailboxSize)
If ($ByMailboxCount){
Write-Host "`nBY MAILBOX COUNT" -Foregroundcolor Red
Write-Host "—————-"
Write-Host "Check to see if the Excess Mailboxes = Required " -NoNewLine
$tmpcheck = ($DatabaseMatrix | Measure-Object Difference1 -Sum).sum
Write-Host $tmpcheck -ForegroundColor Green
Write-Host "`nFinding databases with excess mailboxes"
$Database2MoveOff = $DatabaseMatrix | Where {$_.Difference2 -ge 0}
$ExcessTotal = 0
ForEach($db in $Database2MoveOff){
Write-Host $db.Name -Foregroundcolor Blue
Write-Host "Removing"$db.Difference2 "users`n"
$ExcessTotal += $db.Difference2
$MailboxArray | Where {$_.Database.Name -eq $db.name} | Select -First $db.Difference2 | ForEach{$_.Target = "";$_.Status = "Move"}
}
Write-Host "Total Excess Mailbox " $ExcessTotal
$i=0
ForEach($item in $DatabaseMatrix | Where {$_.Difference1 -gt 0}){
$Mailboxes2Add = $item.Difference1
$MailboxArray | Where {$_.Target -eq ""} | Select -First $Mailboxes2Add | ForEach{$_.Target = $item.Name}
}
Write-Host "`nSUMMARY" -Foregroundcolor Green
$MailboxArray | Group Target
}#ByMailboxCount
#Foreach($line in $MailboxArray){Write-Host $line.Email"`t"$line.database}
Write-Host "`nMove Mailboxes"
$outCSV = @()
$ExcessMailboxes = $MailboxArray | where {$_.Status -eq "Move"}
ForEach($item in $ExcessMailboxes){
$tmpOutCsv = "" | Select email, TargetDatabase
$tmpOutCSV.email = $item.email
$tmpOutCsv.TargetDatabase = $Item.Target
$outCSV += $tmpOutCSV
}
ForEach($line in $outCSV){
$position=$host.ui.rawui.cursorposition
Write-Host $line.email
$position.x = 50
$host.ui.rawui.cursorposition=$position;
Write-host $line.target
}
$outCSV | Export-csv $ExportCSV -NoTypeInformation
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