Outlook and/or Exchange are probably automatically creating an iCal format meeting request for you.

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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
http://www.outlookcode.com/jumpstart.aspx
> When I send a meeting request to someone outside my netowkr it seems to work
> fine. But it says in the online help that you should use an Ical attachment
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>
> Anita