Q: I need a fundamental reason "Why should I patch my Sharepoint boxes" when all I am running is WSS 2.0 (with some fairly weird/unsupported hotfixes) and I have no sites that are running Exchange Public Folder linkages.
A: Microsoft has released an update for Windows SharePoint Services.  This update includes revised time zone definitions for Daylight Saving Time (DST) start/end dates.  This update also includes other fixes.  The Windows DST patch (http://support.microsoft.com/kb/928388) needs to be installed on the server first. 

Description of the update for Windows SharePoint Services:    January 9, 2007

http://support.microsoft.com/kb/924881

Download Center Link: http://www.microsoft.com/downloads/details.aspx?familyid=D002054E-1ECC-4DA5-8E5E-73A5C4FF2998&displaylang=en