Dch48, since you were using Avast and OA, the versions have changed. Both software now allow more compatibility with other software (Avast is more compatible with OA, and OA is more compatible with Avast). Users from both forums, and there are many users using both Avast and OA, agree there are less conflicts compared to the previous versions. I also think that adding both software into exclusions of each is a good idea since both are considered security software and this can avoid potential conflicts should they occur although I've never had any. I realize everyone's system is different, and that is why I still recommend adding these exclusions and keeping their software up to date.