Exchange Service Pack Error

During transition of Exchange 2007 CCR to Exchange DAG. We need to upgrade the Exchange 2007 CCR to service pack 3.

We were following this technet article.

When we ran setup /upgradecms for upgrade Cluster Mailbox. It was interrupted by the following error message  which you might have seen before while trying to installing Exchange 2007 SP2 or Exchange 2007 SP3.


Setup previously failed while performing the action “install”. You cannot resume setup by performing the action “BuildToBuildUpdate”.

If the initial setup of Exchange 2007 SP1 is resumed successfully via the maintenance mode of the setup, the error can be fixed by deleting a watermark and the action registry key.

We find the registry keys at the following locations;


For example delete the following keys;



After deleting the keys  we are able to install the Service Packs.