Please see: http://support.microsoft.com/kb/930879/ for the Exchange DST Tool.
Version 2 of the OS DST patch (KB931836) has been released. This update includes recent time zone updates which were not in the original release (e.g., Newfoundland, Tbilisi, Namibia, W. Australia, Tehran, Brasilia, Manaus). The update will become “Critical” on Windows update on or after February 13th.
Note: as of 9:30am EST, the KB article is not yet live, but the Download link is as follows: http://www.microsoft.com/downloads/results.aspx?pocId=&freetext=931836&DisplayLang=en
Update for Windows Server 2003 (KB931836)
Installing this update enables your computer to automatically adjust the computer clock on the correct date in 2007 due to revised Daylight Saving Time laws in many countries.
Update for Windows Server 2003 for Itanium-based Systems (KB931836)
Update for Windows Server 2003 x64 Edition (KB931836)
Update for Windows XP x64 Edition (KB931836)
Update for Windows XP (KB931836)