Error while installing Exchange 2010 SP2

First of all backup the Exchange Server databases and logs with your favorite backup software

Take a Snapshot the Exchange Server if it is virtual machine before you perform the Service Pack 2 upgrade

When applying EX2K10 SP2 you may get the error below:

Some controls aren’t valid. Setup previously failed while performing the action “Install”. You can’t resume setup by performing the action “BuildToBuildUpgrade”.

 

The Cause:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v14\MailboxRole\Action
Action key is present with value data: Install
The Solution:
Delete Action key under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v14\MailboxRole\Action

Reference Article: http://azatechknow.blogspot.com/2012/02/normal-0-false-false-false-en-gb-x-none.html

  

I then attempted service pack 2 upgrade again and then I got this error below:

The Cause: Symantec Anti-Spam services have some of the listed files above open

 The Solution: I stopped all of the Symantec Mail Security Services and restarted the Service Pack 2 upgrade process again

Run the setup of EX2K10 SP2 again – Be patient again the service pack install can take a while. This time it went through...

Don't forget to Start the Symantec Anti-SPAM services again

Apply the latest Exchange 2010 SP2 Rollup patch or run Microsoft Updates - Be patient again the updates can take a while

A reboot was not  necessary however, I did one anyway

If all is well remove the VMware VM Snapshot