I have a client experiencing the following issue. When attempting to create an appointment for a shared calender in Outlook 2010, the new appointment's "Private" lock button is grayed out and when saving the appointment, it is automatically saving as a non-private appointment. The appointment can be viewed and edited afterwards but the "Private" lock button remains greyed out. I have confirmed that there aren't any modified appointment forms which preset the private option.
Here is a breakdown of the scenario:
1. User1 shares his calendar.
2. User2 opens the calendar of User1, makes new appointments, but all of them are private and the private option is greyed out, so the user can not deselect it.
3. Even with no custom form the private button is greyed out, so user2 can not set private Items.
Thanks in advance,