When you run the Get-ExchangeServerAccessLicenseUser cmdlet to return a list of unique users for the specified license name in a Microsoft Exchange Server 2013 environment, the result for the number of the Exchange Server 2013 Enterprise CALs license displays nothing.
This issue occurs because the Get-ManagedFolderMailboxPolicy cmdlet in the CalCalculation.ps1 script that is used by the Get-ExchangeServerAccessLicenseUser cmdlet is no longer supported in Exchange Server 2013.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 3109539 - Last Review: Mar 15, 2016 - Revision: 1
Microsoft Exchange Server 2013 Enterprise, Microsoft Exchange Server 2013 Standard Edition