Delegates and Meeting Cancellations

All-
I have had a few issues lately with Delegates and Cancellation
requests/notifications. First off, our setup is 3 Exch servers, 2k(no users,
on it's way out), 2k3(all users), 2k7(test accounts only). All users
involved are using Outlook 2k3, except one that is using Entourage 2k4.

Issue #1-
Meeting request from a user to another with a delegate. Delegate proposes
new time, which then shows on her calendar and the bosses. Meeting
coordinator rejects the new time, but neither the delegate or the boss sees
the notification, and their calendars show the proposed time, not the
original time.

Issue #2-
Meeting is setup, and accepted. Meeting Coordinator's delegate(who likely
setup the meeting) cancels the meeting, but the attendees do not see a cancel
notification, and the meeting is still on their calendar, but not the
delegate's or the coordinator's. This occurrence has happened a few times,
but to the same delegate/boss, different users.

I was ready to chalk up #1 to user error, when #2 came accross my desk. I
have checked all permissions and rights, and everyone is setup properly.

Any ideas/help/kicks in the right direction would be appreciated

Thanks
Brian Wright