Apple's Mail Services Update 1.0 for Snow Leopard Server comes with brief release notes, stating only that it addresses "issues affecting overall mail service reliability and performance." Although Apple recommends the update for all users running Mac OS X Server 10.6.2, there have been reports of it causing problems, along with a possible solution outlined in an Apple Discussions thread. It's available via Software Update or the Apple Support Downloads page. Installation instructions for the update are available on Apple's Web site. (Free, 20.59 MB)
Option-click to Hide Apps Quickly
This trick has been available in the Mac OS for years, but many people still don't know it. If you have too many windows cluttering up your screen, you can hide specific ones easily as you work. When you're in any application, hold down the Option key and click on another app's window, on the Dock, or in the Finder to switch to that other app and simultaneously hide all the windows in the previously current app.
Mail Services Update 1.0
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The following thread identifies others experiencing the same problem, with the same series of error message, and identifies a fix that should be better than reinstalling the 10.6.2 installer: http://discussions.apple.com/thread.jspa?threadID=2269047