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raise forest functional level
Need check what before raise forest functional level to 2012 r2 ? and can rollback if use windows server 2012 r2 and current forest function is 2008 r2 ?
Yes, it is doable.
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Dave Patrickour system have exchange 2013 and crm 2015 and an app use kerberos (this effect kerberos ?)
For those products I'd reach out to subject matter experts in dedicated forums over here.
office-exchange-server-administration - Microsoft Q&A
Microsoft Dynamics Social Engagement Forum - Support & Help