I have this same issue with one of my users. It is the default calendar and
she is able to edit any shared calendars she has access to. I have done
everything short of reinstalling Office. Outlook 2003 SP2 on Exchange.

"ArtGle" wrote:


User can not open invitations from her e-mail to accept or decline
invitations to meetings.
She cannot create or modify existing items in her calendar.

And, of course, it's all my fault!