Microsoft Remotely Removed Tor Browser Bundle from more than 2 Million Systems
blog.insecure.in
blog.insecure.in
According to the article all they did was remove some malware that happened to contain Tor. And from the sound of it there was no 'remote kill switch' or anything involved, they just added the malware to their MSE antivirus definitions which subsequently removed it.
Update: Yup, that's what they did. Here is the blog post: http://blogs.technet.com/b/mmpc/archive/2014/01/09/tackling-...
Sensationalist headlines doesn't really work that well on HN.
(Copied my comment over from https://news.ycombinator.com/item?id=7095429)
http://www.zdnet.com/irish-td-attacks-open-source-browsers-a...