Recently, Windows Update began offering the Windows Management Framework 3.0 as an Optional update. This includes all forms of update distribution, such as Microsoft Update, WSUS, System Center Configuration Manager and other mechanisms. The key bit here is that the Windows Management Framework 3.0 includes PowerShell 3.0.
Windows Management Framework 3.0 is being distributed as KB2506146 and KB2506143 (which one is offered depends on which server version you are running – Windows Server 2008 SP2 or Windows Server 2008 R2 SP1).
Windows Management Framework 3.0 (specifically PowerShell 3.0) is not yet supported on any version of Exchange except Exchange Server 2013, which requires it. If you install Windows Management Framework 3.0 on a server running Exchange 2007 or Exchange 2010, you will encounter problems, such as Exchange update rollups that will not install, or the Exchange Management Shell may not run properly.
Full story at:
Exchange Team Blog
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