We have a Small Business Server 2008 with both Outlook 2003 (SP3) and Outlook 2007 (SP2) clients. If a client is running Outlook in cached mode and they click the calendar button in a meeting invite, the calendar opens up and then Outlook hangs and requires an End Task.
Here are some of the troubleshooting steps I've tried, in no particular order...
1. Delete the OST file and allow a new one to be created
2. Connected to the Exchange server using RPC over HTTP from a remote computer that doesn't experience the issue when connected to a different Exchange server - problem exists on that profile too
3. Run SCANOST - it reports "The message with the subject 'Hidden Message' exists in your mailbox on the Microsoft Exchange Server but not in your offline folder file." Researching this error didn't lead anywhere
4. Changed Calendar view to "Active Appointments", "Events" and "By Category". This fixed it, but unfortunately nobody wants to use the "Active Appointments" view (the problem exists with the "Day/Week/Month" and "Day/Week/Month" views)
5. Started Outlook with the /Safe, /rpcdiag, /noextensions switches without luck
6. Disabled all addins
7. Moved all calendar and task items to different folders
8. Disabled the Windows Firewall on the server (there is no client based firewall on the testing machine)
9. Create a brand new user account on the server and invite them to a meeting, then log that new user on, open the meeting invite and click the calendar button - problem exists
10. Turn off cached mode. This rectifies the problem, but it comes back when cache mode re-enabled (even if creating a new OST file)
It seems to be server specific. As I pointed out, I have a computer that connects to Exchange Server A in cached mode without any problem, but when it connects to Exchange Server B, the issue exists. All the client machines tested so far that connect to Exchange Server exhibit the same behaviour.
I've spent about 6-7 hours hours on this so far, so any assistance you can provide would be greatly appreciated.