So, I'm an IT admin, and this may have very limited use, but reading this site everyday has made my job easier many times. In the hopes that I can do the same for someone else...
Outlook 2001 running under Classic with Exchange Server (devilish setup, I know, but common on Microsoft networks) does not respect the Daylight Savings change, even though OS 9 does. The Daylight Savings Editor will allow you to edit the time zones on OS 9 so that Outlook 2001 has the proper time.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20070313155815194