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Calculating Mailbox Sizes using Exchange Web Services and Powershell

Normally if you want to work out the size of a mailbox or the size of a mailbox folder as an administrator you would use get-mailboxstatistics and get-mailboxfolderstatistics the Exchange Management Shelll cmdlets which are the fastest and easiest way of retrieving this information on 2007 and 2010. However if you want to get the Mailbox size using normal user rights or the EMS cmdlets aren't an option then EWS can be used. There is no one property inside a mailbox that can be used to get the total size of a mailbox so like you needed to do in 2003 and earlier to calculate the size of a mailbox you need to get the size of each mailbox folder then sum these together. To get the Size of the Mailbox Folder and Deleted Items within a folder requires the use of the following extended Mapi properties

PR_MESSAGE_SIZE_EXTENDED and PR_DELETED_MESSAGE_SIZE_EXTENDED

To get the properties on all of the folders in a Mailbox a Deep Traversal findfolders operations from the Root of the Mailbox can be used.

One of useful things you can do with EWS that you can't do in EMS with the cmdlets is filter this query by the Mapi FolderClass (which is different from the folderscope property). In the large script posted below I've commented out the filter to do this but the lines are

##$folderItemType = "IPF.Note"
##$sfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.FolderSchema]::FolderClass, $folderItemType)
##$fiResult = $Service.FindFolders($folderidcnt,$sfSearchFilter,$fvFolderView)

The normal EWS Managed API power shell script I've put a download of here the code looks like

$MailboxName = "user@domain.com"
##$folderItemType = "IPF.Note"
$rptCollection = @()


$dllpath = "C:\Program Files\Microsoft\Exchange\Web Services\1.1\Microsoft.Exchange.WebServices.dll"
[void][Reflection.Assembly]::LoadFile($dllpath)
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2007_SP1)


$windowsIdentity = [System.Security.Principal.WindowsIdentity]::GetCurrent()
$sidbind = "LDAP://<SID=" + $windowsIdentity.user.Value.ToString() + ">"
$aceuser = [ADSI]$sidbind
$service.AutodiscoverUrl($aceuser.mail.ToString(),{$true})

$TotalItemCount = 0
$TotalItemSize = 0

"Checking : " + $MailboxName
$folderidcnt = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Root,$MailboxName)
$fvFolderView = New-Object Microsoft.Exchange.WebServices.Data.FolderView(10000)
$fvFolderView.Traversal = [Microsoft.Exchange.WebServices.Data.FolderTraversal]::Deep;
$psPropertySet = new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties)
$PR_MESSAGE_SIZE_EXTENDED = new-object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition(3592,[Microsoft.Exchange.WebServices.Data.MapiPropertyType]::Long);
$PR_DELETED_MESSAGE_SIZE_EXTENDED = new-object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition(26267,[Microsoft.Exchange.WebServices.Data.MapiPropertyType]::Long);
$PR_DELETED_MSG_COUNT = new-object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition(26176,[Microsoft.Exchange.WebServices.Data.MapiPropertyType]::Integer);
$psPropertySet.Add($PR_MESSAGE_SIZE_EXTENDED);
$psPropertySet.Add($PR_DELETED_MESSAGE_SIZE_EXTENDED);
$psPropertySet.Add($PR_DELETED_MSG_COUNT);
$fvFolderView.PropertySet = $psPropertySet;
##$sfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.FolderSchema]::FolderClass, $folderItemType)
##$fiResult = $Service.FindFolders($folderidcnt,$sfSearchFilter,$fvFolderView)
$fiResult = $Service.FindFolders($folderidcnt,$fvFolderView)
foreach($ffFolder in $fiResult.Folders){
$TotalItemCount = $TotalItemCount + $ffFolder.TotalCount;
$FolderSize = $null;
if ($ffFolder.TryGetProperty($PR_MESSAGE_SIZE_EXTENDED,[ref] $FolderSize))
{
$TotalItemSize = $TotalItemSize + [Int64]$FolderSize
}
$DeletedItemFolderSize = $null;
if ($ffFolder.TryGetProperty($PR_DELETED_MESSAGE_SIZE_EXTENDED, [ref] $DeletedItemFolderSize))
{
$TotalDeletedItemSize = $TotalDeletedItemSize + [Int64]$DeletedItemFolderSize
}
$DeletedMsgCount = $null;
if ($ffFolder.TryGetProperty($PR_DELETED_MSG_COUNT, [ref] $DeletedMsgCount))
{
$TotalDeletedItemCount = $TotalDeletedItemCount + [Int32]$DeletedMsgCount;
}
}
$rptobj = "" | select DisplayName,LegacyDN,TotalItemSize,TotalItemCount,TotalDeletedItemSize,TotalDeletedItemCount
$rptobj.DisplayName = $_.DisplayName
$rptobj.LegacyDN = $_.LegacyExchangeDN
$rptobj.TotalItemCount = $TotalItemCount
$rptobj.TotalItemSize = $TotalItemSize
$rptobj.TotalDeletedItemSize = $TotalDeletedItemSize
$rptobj.TotalDeletedItemCount = $TotalDeletedItemCount
$rptCollection += $rptobj

$rptCollection
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All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.