Tried 4.8 - hangs (outlook, logon (Vista), web pages). Tried the beta (4.8.1187) - hangs (outlook, logon, web pages).
4.8 was not ready for release, judging by my issues and all the others in this forum.
Despite the well meaning help from the evangelists (e.g. what other outlook add-ins), the simple fact is that for me (and a lot of other people), avast has worked really well for many previous versions, but 4.8 is a show-stopper. Yes, we may have things that are conflicting with 4.8, but they didn't conflict with 4.7, 4.6, 4.5 - you get the picture.