Outlook 2000 scheduling problem

We have Outlook 2000 and I have added a manager's calendar to my Outlook bar and vice versa.

When I send a meeting/appointment request, my manager accepts it and all looks good until I go into the Calendars. I can see the meeting scheduled on my calendar but not on her calendar on my outlook. Same thing on hers....she can the meeting scheduled on her calendar but not on my calendar on her outlook.

The other thing is that my manager has also set this up with another co-worker and between them, the scheduling works...both of them see all meetings on both calendars in their individual outlook bars.

So, why won't it work between my manager & myself?

Any help would be appreciated.

Thanks
Teresa