Some of your invitees might have delegates.

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Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Author of
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> We are sending invitations to people via the calendar and
> for some reason the invites are going to more people than
> it should. Is there a way to fix this?