A Powershell cmdlet to help discover which CAS Server a user has been using (Requires Exchange Management Shell)

Get-CASServer.ps1

function Get-CASServer {
    <#
    .SYNOPSIS
      A Powershell cmdlet to help discover which CAS Server a user has been using 
      (Requires Exchange Management Shell to be running during execution)
    .PARAMETER Alias
      The exchange user alias.
      Will take pipeline input from get-mailbox.
    .EXAMPLE
      Get-Mailbox joseph.kern | Get-CASServer | 
          select ApplicationID, ServerName, clientname, lastaccesstime, Windows2000Account
    .NOTES
      Cleaned up from 
      http://serverfault.com/questions/559687/is-there-a-way-to-determine-which-exchange-2010-cas-server-a-user-is-connecting
    #>

    [CmdletBinding()]

    param (
    [Parameter(Position=0, ParameterSetName="Pipeline", ValueFromPipelineByPropertyName=$true, Mandatory=$true)]
    [String]$Alias
    )

    Get-LogonStatistics -Identity $Alias | ? {$_.applicationid -eq "Client=MSExchangeRPC"}

}