Also those calendar entries that have been pushed up an hour will they revert back once Exchange is patched?

Q: Also those calendar entries that have been pushed up an hour will they revert back once Exchange is patched?
A: You can try to run the tool again with the /prepatch option to correct some of these appointments if they are off by one hour, but you may find that you need to correct some appointments manually. Make sure you're using the updated version of the tool (KB 933146)