I just tried upgrading our build form 7506 to 7509 and it failed. The service will not start. No problem I though; I'll just use the "uninstall" option that is present in updatemanager. So I start updatemanager, and pick which service pack to uninstall. It asks me if I am sure it needs to be uninstalled or not, I choose OK. So I wait as it begins the process… and wait.. and wait.. and wait.. about 10 minutes later the attached screenshot window pops up.

"Sorry, uninstallation is currently not supported."

After all that? After starting updatemanager that has a button labeled uninstall. After following all the prompt for uninstalling? After making me wait and wasting my time, this is all I get?

If uninstallation is not supported then REMOVE the option from updatemanager and make it CLEAR that when you install a service pack there is no way to uninstall it.

Jeez.. (yes.. I am VERY frustrated at this point.) Now my only way out of this is to complete remove SD+, reinstall 7506 from scratch and reimport our backup data. What a waste of time.