Hi,
I wouldn't be to worried, a lot of people won't trust Microsoft (imo) because it has made to many screwups in the past. In reality I would rather have a Norton antivirus product then have this Microsoft product on my system. I have tried the beta it is a bigger hog then Norton. So really I am not to worried but other companies will be, it will be intresting to see what the competitors will do to get people to buy their product and not Microsoft's, which may mean lower prices in security. Overall I think it will be very intresting to see what happens.