I've gotten a lot of emails asking what happened to the Exchange Server 5.5 Service Pack 1 release I mentioned last week. Well, thanks to Charlie Heitzig, I can now report with certainty that Microsoft has temporarily pulled SP1 because they discovered a problem with it. If you did download the release that was there last week, you may want to uninstall it and wait for the re-release, which is expected in just a few days