Insufficient rights to update single occurrence of recurring meeti

R

Rav

We use Outlook 2003 and Exchange 2003, and I have a single user who has
attempted to invite another employee to a single occurrence of a recurring
meeting that he has scheduled. Upon attempting to send the update, he
receives the following error:
You do not have sufficient permission to perform this operation on this
object. See the folder contact or your system administrator.

I have checked his permissions for his mailbox in ADUC, and he has read
permissions and full mailbox access. With that being the case, is there any
other permissions he needs?
Thanks in advance
 
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