Check what Outlook versions your clients are using

Sometimes, especially when you are thinking of migrating Microsoft Exchange, you would like to get a basic idea of what versions of Outlook are in use. Well, in back in Exchange 2007 you would just execute a simple PowerShell command:

Get-MailboxServer | Get-LogonStatistics | Select UserName,ClientVersion,LastAccessTime,ServerName

But this is not working anymore in Exchange 2010, 2013 and 2016. You need more to know a little more of Powershell. Lets say you are using Exchange 2010 (this is version V14).

# This is just default path to Exchange 2010 RPC logs. Change it to match your Exchange version.
$logpath = 'C:\Program Files\Microsoft\Exchange Server\V14\Logging\RPC Client Access'

# We limit the amount of logs by timeframe. This is to get more current view.
$files = Get-ChildItem $logpath |Where-Object {$_.LastWriteTime -ge (Get-Date).AddDays(-15)}

# Now, let's get the logs.
$logs = $files | ForEach {Get-Content $_.FullName}| Where-Object {$_ -notlike '#*'}

# We covert the data to PowerShell objects
$result = $logs |ConvertFrom-Csv -Header date-time,session-id,seq-number,client-name,organization-info,client-software,client-software-version,client-mode,client-ip,server-ip,protocol,application-id,operation,rpc-status,processing-time,operation-specific,failures

# And finally we filter the client information  and group it by version number.
$result | Where-Object {$_.'client-software' -eq 'OUTLOOK.EXE'}|group client-software-version

Now you just need to compare the results with the Outlook version in the following table.