Outlook will grey out and say it lost internet connection and it will recover, It never recovers and locks up.  I have to refresh web browser window to get it to unlock.  This tends to happen mostly when I am composing an email and it saves it to a draft.  This happens on 4 different machines (3 XP, 1 windows 7) and on 2 different web browsers firefox and IE. I have not tried it on any other web browsers or systems.