Exchange 2010 SP2 setup/upgrade failed while performing action install

Today i ran into a very weird problem during the installation upgrade of an Exchange 2010 server. The server has all roles on one server ( CAS/HUB/MBX ) and cleany installed just one day ago, SP1 and Rollup 8.

After downloading SP2 and performing the setup i was suprised with an error screen:

Some controls aren't Valid. Setup previously failed while performing the action "install". You can't resume setup by performing the action "BuildToBuildUpgrade".

Check your registry keys to see if one still contains Action = install

Go to the following HKLM\Software\Microsoft\Exchange Server\V14\

In my case i found the action key in \MailboxRole\

After exporting the affected key and deleting it, i restarted the setup/upgrade of SP2 and it executed as i was hoping for.

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