Not if the mailbox has been told to reject conflicting bookings.

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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
>I want to be able to schedule a meeting using a resource that is already
> booked for that time period. Is there a way to tell Outlook to allow
> 'double-booking' of certain resources?