there are addins that remind them or you can use VBA.
http://www.slipstick.com/emo/2004/up040902.htm#blank

--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Coauthor, OneNote 2003 for Windows (Visual QuickStart Guide)
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"Stuart E" wrote in message
oups.com...
Are there any simple solutions/settings to ensure that users are either
forced or reminded to provide a subject when composing and sending
emails? Clients are Outlook 2000 or better in an Exchange 2003
environment.