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…