Clustered Mailbox Server Failed Error: Setup previously failed while performing the action “BuildToBuildUpgrade”

Hi Readers,

We were performing the decommission of Exchange 2007 CCR servers, on all our servers uninstall went fine except one of the CCR, uninstall resulted in below error:

Clustered Mailbox Server Failed Error: Setup previously failed while performing the action “BuildToBuildUpgrade”

On researching We found that there might be watermark reg key because of previous failed check.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\v8.0\ClusteredMailboxServer

Delete Watermark reg key & than try uninstall again. (it should work fine now)

Regards

Sukhija Vikas

http://msexchange.me

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