I've been interacting quite a bit with with Microsoft people in the last couple of years.
I was shocked to meet a bunch of people within Microsoft that have recently migrated there from Sun. Joel Franusic, the BizSpark evangelist for Silicon Valley has roots as a php/perl/linux Admin, and has been a Super Happy Dev House organizer since the early days.
They are working really hard to change Microsoft's attitude towards open source and *nix in general. They are trying to change the attitude from one of competition to that of cooperation. And, I believe that's why you see things like Microsoft joining the Apache foundation, Microsoft contributing a lot of patches to Linux, funding the port of Node.js to Windows, etc...
So, perhaps the change in wording is a hall mark of a change in attitude, rather than a declaration of victory. I could be wrong.
The crew at BizSpark Silicon Valley have been the biggest supporters of our Hackers & Founders tag line of the "Linux of Incubators." http://angel.co/hackers_and_founders
Microsoft BizSpark sponsors a number of Hackers & Founders events in Silicon Valley[1]. I don't make any money from them, however. They cover the costs for some of the events that we hold to help startups and founders.
ref:
[1] http://hackersandfounders.tv