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n0ija's avatar
n0ija
Copper Contributor
Jan 23, 2023

RecoverServer with CU12 media no longer works after January 2023 SU

Luckily I found this issue in my Lab because it could be a very big problem trying to recover exchange services after a production failure. I see no note of this in the release notes for the January SU.

 

I'm trying to do a /Mode:RecoverServer installation with the CU12 media on a clean server where the original server had the January SU installed, but it fails with the error "Exchange Server version Version 15.2 (Build 1118.21) or later must be used to perform a recovery of this server."
I was NOT able to complete the install by using the /UpdatesDir parameter because I get a "VerifyMspSignature" error on the msp. Both the exe and msp can be used to update another CU12 server.  I tried extracting the msp from the .exe file and from the .cab file download from windows update catalog but both fails with the same error.
In a real case where time is of the essence this would have caused big problems!

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