I have a linked mailbox that is accessed by an account in a trusted domain. The account can access e-mail, send e-mail, free-busy search, etc, just fine. However, there seems to be a permissions issue with the public folders and shared calendars. When trying to access the public folders for which permissions have been assigned to the linked account from the trusted domain account, I get an error, or just can't see the folders. The only way I can view public folders is by setting default permissions on the folder to 'Read'.
I've found some other threads that reference this problem, and a blog that no longer exists as the solution: http://social.technet.microsoft.com/Forums/en-US/exchangesvrclientslegacy/thread/5fdf4cd7-3543-4b5d-94cc-317446ddaa46
If anyone has any ideas or the solution that was shown in the above referenced blog, I'd be very grateful!
-shane