I would not worry at all about the security threats. It's been 7 years since XP has been replaced the Vista and there must be a very good reason for (as Paul puts it) "...tens of millions of users...
Paul, I think I realize why Windows Phone isn't doing so well in the market. All these "new" features are old for Android and possibly iOS.
It hasn't even been a year since Google did this first to demonstrate Google Hangout
You need to do away with Microsoft Phone and Surface devices...they're losers. Want me to reserve DroidSupersite.com for ya? (just kidding)