How Microsoft IT Does Patch Management

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My old team - IT Showcase - packages up great information for IT Pros on how IT works at Microsoft. For the latest on how Microsoft IT does patch management, see:

The latest PPT presentation  and the earlier SMS PPT. And/Or you can read the 1 pager. 
 
And finally  
https://www.microsoft.com/technet/itsolutions/msit/security/mspatch.mspx