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)
Expand Finder Columns Quickly
Column view in the Finder is great for navigating through your disk's hierarchy, but the columns often aren't wide enough to show the full names of all the files. To expand a column to a width that will show all file names in their entirety, double-click the handle that you would normally drag to expand or shrink the column. To expand all the visible columns to that width, Option-double-click the handle.
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