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Microsoft
First published on TECHNET on Feb 28, 2007

Q: We're running Exchange 2003 w/SP1 and have applied the Windows DST update and Exchange update for SP1.  Are there any issues in applying Exchange SP2 in terms of it "losing" the DST modification?
A: You should reapply the Exchange DST update after service packing to Exchange SP2. You should also reapply KB926666 as well, as Exchange SP2 will overwrite some of the patched files