I did not know this, but it turns out Mircrosoft keeps a list of all the ports that various MS services use. This list is available for download as an Excel spreadsheet from the Microsoft site.
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Good find, never saw that document before. Too bad it doesn’t include the ports used by Windows Small Business Server 2003. You can find a list of those ports at http://thebackroomtech.wordpress.com/2008/06/04/ports-to-open-on-a-firewall-for-sbs-2003-communication/