There is a known incompatiblity between Outlook 2000 and later versions related to reminders on meeting requests sent in iCalendar (aka iCal) format. To resolve this issue, do one of the following:
-- Contact Microsoft Product Support Services to obtain the Outlook 2000 post-SP3 hotfix described in this article: http://support.microsoft.com/?kbid=823199
-- Tell the senders to remove any reminder before sending you an iCal meeting request.
-- Tell the senders to send to you in native Outlook meeting request (RTF) format, not as iCal.

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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
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We are having this same issue, but sender and receiver are both using
Outlook 2002 SP3, same office, same mailserver, same network. The
meeting request/appointment will go out to several people- most get it
correctly a few don't. All machines have all windows and office
updates available. I have done detect/repair, re-intall of office all
to no advail.
Please don't recomend the sender change to vCalendar format or rich
text, because of various senders that is just not a good resolution. I
would like to be able to fix the issue on the receiver's machine. Any
help would be appreciated.
> There is a known incompatiblity between Outlook 2000 and later versions related to reminders on meeting requests sent in iCalendar (aka iCal) format. To resolve this issue, do one of the following:
>
[quoted text clipped - 26 lines]
> >
> > Ian
istrange63@hotmail.co.uk - 19 May 2006 23:53 GMT
We also are still are having the problem, at the receiver's end.
BUT this was working ok a few weeks back
Asked the receiver to send a dummy appointment and this drops into my
calendar ok
So it *must* be something at my end
But I know not what ..
any help ? much appreciated
> We are having this same issue, but sender and receiver are both using
> Outlook 2002 SP3, same office, same mailserver, same network. The