Here in NZ one of the largest email providers (Yahoo) was hit with a virus whereby peoples address books were used to send out an email that contained a malware infected web link. I received one of these emails and as it was from a contact I deal with regularly, opened the email and clicked on the link from my windows phone (7.5). This is something I wouldn't normally do and only did so because the email appeared to be from someone I know. I doubt win 7.5 users make for much of a target but I don't know enough about this sort of stuff to know if my phone has been compromised in any way?