I am trying to install Exchange SP2 os an SBS 08 server. I have solved all the errors up to the upgrade point where it fails with the Windows installer. I have now found an article and installed the 'SBS2008 SP2 install tool' but it fails as it says Exchange SP1 must be installed!! At this point i have an exchange that is not working and i can't get SP2 on. Is there anyway i can reverse the install back??