And don't install KB2506146 on SBS 2008 either

Windows Management Framework 3.0 / PowerShell 3.0 and Exchange - Michael's meanderings...:
http://theessentialexchange.com/blogs/michael/archive/2012/12/13/windows-management-framework-3-0-powershell-3-0-and-exchange.aspx

While you are at it, don't install WMF 3.0 on SBS 2008 either.

Windows Management Framework 3.0 for Windows Server 2008 (KB2506146)

Locale: All
Deployment: Optional/Automatic Updates, WSUS, and Catalog
Classification: Updates, Non-Security
Target platforms: Windows Server 2008
Approximate file sizes:

  • Windows Management Framework 3.0 for Windows Server 2008 update: ~ 10778KB
  • Windows Management Framework 3.0 for Windows Server 2008 for x64-based Systems update: ~ 14804KB

Description:
Windows Management Framework 3.0 provides updated management functionality for Windows Server 2008. Windows Management Framework 3.0 includes Windows PowerShell 3.0, WMI, and WinRM 3.0, along with other management features.

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