Exchange 2013 CU installation Failed after Server Crash/Power outage

Sometimes after server crash durring exchange CU installation there is seriouse issues. In this case CU 11 cannot be installed . Setup was crashing with error. in Exchange setuplogs we see:

[1] 0. ErrorRecord: Der Pfad “C:\Program Files\Microsoft\Exchange Server\V15\UnifiedMessaging\grammars” kann nicht gefunden werden, da er nicht vorhanden ist.
 [1] 0. ErrorRecord: System.Management.Automation.ItemNotFoundException: Der Pfad “C:\Program Files\Microsoft\Exchange Server\V15\UnifiedMessaging\grammars” kann nicht gefunden werden, da er nicht vorhanden is

Obviouse solution is to create the missing folder. Created a folder called grammars under the following location

         %Exchange install path%\Program Files\Microsoft\Exchange Server\V15\UnifiedMessaging

unfortunately we have to remove the watermark in registry on following location :

HKLM\SOFTWARE\Microsoft\Exchange server\V15\Unified Messaging

now the setup can be rerunned and will complete successfuly.

 

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