SBS 2008, Exchange 2007. A shared calendar in Tom's account called 'marketing' works just fine for the other users to which it is shared (they are using Outlook 2007), but Tom himself cannot edit the calendar when logged into OWA (he's using OWA because he's on a Mac). Or rather, he can add and delete entries to the shared 'marketing' calendar, but these changes are not seen by anybody else, and he cannot see on OWA any of the additions or changes made by anybody else via Outlook 2007.
8/22/2022 - Mon
This is the best money I have ever spent. I cannot not tell you how many times these folks have saved my bacon. I learn so much from the contributors.