You could forward them a vCalendar or iCalendar item and let them open it,
then decide for themselves whether to keep it.

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Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Is there any way that I can get a meeting to show on someone's calendar,
> without inviting them as an optional attendee? I need people to be aware
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>
> Thank you!