PowerShell - Message 'Cannot use remote PowerShell because System.Management.Automation assembly is not available'

Problem:

You are attempting to import the size of mailboxes from your Exchange 2010/2013 servers and you systematically get the following error message:

PrMAPIs.PromodagPWShellUnavailable: Cannot use remote PowerShell because System.Management.Automation assembly is not available.

Explanation:

Starting with Exchange 2010, it is no longer possible to import mailbox size using MAPI. PROMODAG Reports now runs PowerShell commands to get that information from Exchange. However, PowerShell is not installed on your computer.

Solution:
Download Windows Management Framework Core - that includes Windows PowerShell 2.0 and WinRM 2.0 - from the Microsoft Download Center or run Windows Update to obtain it automatically.

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