Three people in my office are using Outlook 2010. We're the only Office 2010 users in our organization. When any one of us selects a calendar in the All Public Folders, it hangs Outlook. We have to close Outlook via task manager. I'm running Exchange 2007. Outlook 2007 users don't seem to be having this problem. Selecting a Contacts, or Notes public folders seems to be OK, but if I select a calendar - LOCKED UP!! I have tried in cached mode and not in cached mode with no difference. I can access the public folder calendar via OWA.