On 3/18/2008 5:15 PM PT, PA Bear [MS MVP] typed:

Is the machine fully patched at Windows Update? If it was and you had
the "Automatically adjust for DST" option enabled, you shouldn't have
had to adjust anything when DST came into effect. This also assumes
your date, time, and time zone settings were correct at 02:00 local time
on 09 Mar-08.

DST Support Center
http://support.microsoft.com/gp/cp_dst

Check-in at the DST Support Center and see if the machine's missing any
DST-related updates. If everything's OK on your end, the problem is on the
mailserver's end. (I've seen several instances of this since DST began on
09 Mar-08.)

See my "Did MS release a time zone update in the past?" thread. Maybe
related?
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