Windows has been in the wild a lot longer. Since 1985.

It is not easy to exploit this OpenSSL bug. In fact, I don't think there are any reported cases of it ever having been exploited. It's been fixed for a while already. I believe immediately after it was fist found, it was fixed, and new software was available for immediate installation.

I am a LOT more worried about some hacker getting into a merchants database and stealing data in bulk. That method is preferred by hackers, because they get so much more data for their efforts. They aren't going for the "small potatoes" of trying to intercept individual transactions going across the internet so much anymore. The NSA is doing that, but not the hackers trying to steal your information.