Earlier quoted context omitted.
They’re doing this by banding together to acquire Novell’s old patents (the “CPTN” group including Microsoft and Apple) and Nortel’s old patents (the “Rockstar” group including Microsoft and Apple), to make sure Google didn’t get them; seeking $15 licensing fees for every Android device; attempting to make it more expensive for phone manufacturers to license Android... From the original Google blog post.
But Google had the choice to be a part of the consortium, according to Microsoft's counsel. Assuming that invitation was indeed extended, how does that jive at all with what you just quoted?
From the update to the original google blog post. Maybe you should read the whole thing. It's not that long. http://googleblog.blogspot.com/2011/08/when-patents-attack-a...