Forum Discussion
raise forest functional level
Yes, it is doable.
--please don't forget to upvote and mark replies if helpful--
Shouldn't be a problem as long as the 2008 are gone first.
To activate the newest forest-wide features, all the domain controllers in the forest must be running the Windows Server operating system version that corresponds to the desired forest functional level. Additionally, the current domain functional level must already be at the newest level. If these requirements are met, the administrator can raise the forest functional level.
How to raise Active Directory domain and forest functional levels - Windows Server | Microsoft Docs
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
