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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".

Solution:
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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