"Diane Poremsky [MVP]" wrote:

Office Online calendars are shared as read-only.


But what about my situation where we use Exchange 2003 and my user is
running Outlook 2007. The person he has given Publishing Author privileges
to is using Outlook 2003. When they both have the calendar open, user 2
cannot add items. the owner must exit Outlook in order for user 2 to add.
What settings could I change to fix this?