Check the problem user's settings under Tools | Options | E-mail Options | Tracking Options. "Process requests and responses on arrival" needs to be unchecked.
--
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

"Rossingol" wrote in message ...
A user has had this problem in Outlook XP and now Outlook 2003. Meeting
requests are accepted automatically and then double booked when the user
accepts the meeting. I have tried the tools, options, . . . resource and
tried turning off auto preview of message thinking that was somehow forcing
acceptance. I am stuck and can't quite figure it out.