Windows Intune–Free Trial
Can be used on up to 25 PCs—each PC requires a qualifying Windows professional license or higher.
The 30-day trial only includes the cloud service. If you are interested in evaluating Windows 7 Enterprise, please look into the 90-day trial.
Get it at https://www.microsoft.com/en-us/windows/windowsintune/try-and-buy.aspx
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Designing a backup less Exchange 2010 Architecture
Microsoft Exchange 2010 CAS Array – Steps and Recommendations
Appear Offline in Microsoft Office Communicator Server 2007