In Outlook 2003 (setup as exchange client), reminder for new appointments is
always set as 18 hrs. I checked in options default is 15 mins. I tried
changing the default to some other time then back to 15 mins. Tried
restarting Outlook but no luck. What could be wrong?

18 hours is the default reminder time for all-day appointments, and that default cannot be changed.

--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx

"Sam" <(E-Mail Removed)> wrote in message news:ABFBBF38-94A3-4CE2-B857-(E-Mail Removed)...
> In Outlook 2003 (setup as exchange client), reminder for new appointments is
> always set as 18 hrs. I checked in options default is 15 mins. I tried
> changing the default to some other time then back to 15 mins. Tried
> restarting Outlook but no luck. What could be wrong?