We are testing Outlook 2007 and so far we have not been able to accept
meeting invitations or send them. They disappear from the calendar all
together once they are accepted. This is happening on the Outlook 2007
clients, accessing Exchange 2003 mail. The meeting invitations are being sent
to and from Outlook 2003 as well.

The error message that we receive in an "undeliverable message" is pasted
below



Your message did not reach some or all of the intended recipients.

Subject: Accepted: FW: (customer specific information removed)
Sent: 12/6/2006 3:45 PM


The following recipient(s) cannot be reached:

(customer specific email address removed) on 12/6/2006 3:45 PM

This message could not be sent. Try sending the message again
later, or contact your network administrator. You do not have sufficient
permission to perform this operation on this object. See the folder contact
or your system administrator. Error is [0x80070005-0x80070005-0x000508].

We have checked the permissions and added the user to his calendar with
Owner privileges.

Any help is appreciated.