Microsoft offers a hotfix for Outlook 2000 to improve its compatibility with iCal/vCal 2.0 meeting requests. See http://support.microsoft.com/?kbid=823199 . Alternatively, have Outlook 2002/2003 senders avoid using reminders in the meeting requests they send to Outlook 2000 recipients.

Signature
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
> People using Outlook 2000 can send or forward meeting notices to my OL 2003
> just fine, but when I send a meeting notice to them, their system doesn't
> recognize the notice and schedule the meeting. How do I get around this
> apparent backward compatibility problem?