A way to force Daylight savings time? (Repost)

I have seen the postings regarding the daylight savings within Outlook
and appointments being an hour off, but is there a way to force them
all on? Maybe a registry setting or policy of some kind? I have some
on and some off and without going to the workstations (or worse yet
having the users do it) I don't know how many are wrong.

We are on Exchange 2003 (SP1) and all running Outlook 2003.