I had installed ACT! 2011 on my main system running Windows 7 Professional and it also has Office 2010 on it. After I did that, Outlook would freeze up two or three times a day; sometimes more. I would have to kill the Outlook program; it would restart and be fine for awhile until the next time it would lock up. I have rebuilt / compacted my Email but still same issue - I took ACT! off, problem disappeared. I put it back on since I wanted to use it and the problem returned. ACT! says it is up to date but dont understand why this is causing it to lock up - any suggestions?