A known issue since at least Outlook 2000. I don't think any Exchange patch
is going to solve it, but I am not privy to the Exchange program managers'
thoughts.

Signature
Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. Due to
the (insert latest virus name here) virus, all mail sent to my personal
account will be deleted without reading.
After furious head scratching, JonMartin asked:
| Most of what I have read would indicate that giving others read only
| rights to your appointments but restricting some appointments by
[quoted text clipped - 4 lines]
| http://office.microsoft.com/en¬-us/assistance/HP011111491033.¬aspx
| http://office.microsoft.com/en¬-us/assistance/HA011456981033.¬aspx