Probably not possible but post in an Exchange group.

--�
Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.

After furious head scratching, jjmcgee asked:

| I have a user who works for two separate organizations, both
| geographically and separate networks. Both organizations luckily use
| MS Outlook. I would like to create one shared appointment calendar so
| both organizational groups can view and update information on the
| calendar. Access would be limited to only a few authorized
| administrators. What is the best approach to accomplish this in
| Outlook? What would be a good reference to read and learn about this?