I just went to install SP1 on a new Exchange 2010 server that I recently deployed and was completely caught off guard by how many hotfixes I needed to install before SP1 would even attempt to install. Just take a look at the prerequisites and you’ll understand what I mean: http://technet.microsoft.com/en-us/library/bb691354.aspx
I find it kind of odd that you have to download all of these hotfixes and register for these downloads. If they’re only supposed to “fix the computers that are affected by the problems listed in this article” then why aren’t they included in SP1 to begin with???
Anyway, I gave up on the installation for tonight, but continued to search for answers so that I’d be ready for another time. I came across this blog post that might be helpful. Don’t ask me if it is, I haven’t tried it yet.