We're using Outlook 2007 and are having challenge sharing calendars between some of our users. The problem accounts can see others' calendars but when they try to share theirs, we're getting the "...default delivery location must be Microsoft Exchange." If I go into account settings, Exchange server is the default delivery type. Is there some other setting somewhere that may be getting in the way?

What permissions do you have set on the users Calendars you are trying to share?MVP Exchange Server

Did you try requesting for sharing the calendar for the users? If not, you can try it and accept the request and viceversa.If you are still not able to, are the users in the same server?- Nagesh

Hi,Any updates?And what's exchange version do you use? Exchange 2007 or exchange 2003? Do the users use MAPI?when they try to share theirs, we're getting the "...default delivery location must be Microsoft Exchange." Do you mean after you navigate to Calendar-> right click the "Calendar"-> Change Sharing Permissions..., you can the errror message?Frank Wang