No EV-Archiving after Exchange Update Rollup 5 v2

Hi Folks,

one of my Customer was complaining that his EV-Server would not archive any more. I was digging around and found out that it seems to be the Installation of Update Rollup 4 V2 or Update Rollup 5 V2 since the installation Date of these 2 Rollups correspond with the stopping of the archiving.

I get MAPI Errors when EV tries to connect to the Exchange.

I reapplied both Powershell Scripts for Throttling and EV-Permissions. I reinstalled Outlook on the EV-Server and reapplied all Office Hotfixes.

I ran fixmapi.exe on the EV-Server. 

EV Version is 10.0.2

Has anyone had this issue already and can give me a Hint on where else to look for

Thanks,

Holger