That's all well and good.
But.
But: I've been hearing this for well over a decade. "Microsoft's attitude toward Linux is changing." Again and again and again and again.
And then some new instance of FUD emerges, or a legal attack on a Free Software / open source advocate or company, some trumped-up performance benchmark, chairs in low-earth orbit. Whatever. The behavior has always failed to match the rhetoric.
I'm sure there are people at Microsoft who like Linux and respect it a bunch. With a few tens of thousands of employees, I also suspect there are those who dislike it, hate it, and/or misunderstand it badly.
As for the company as a whole, my read is that the overall attitude remains negative.
I'll believe there's a lovefest for Linux after 5-10 years of non-idiotic behavior from Microsoft.
As for caring: not so much anymore. Microsoft are increasingly irrelevant to the tech landscape. Not that they don't have a huge presence, but it's simiply not as significant to future development as it was ten or twenty years ago. Apple have a bigger market cap and are dominating emerging consumer markets (phones, tablets), Google are beating hard on Apple's heels and are pushing traditional enterprise tools (desktop apps, mail, calendar) into the cloud. Various cloud service providers are abstracting large server farms for many organizations. You can get your job done while only touching on Microsoft products very tangentially in more and more places.
It's no longer a world of "a PC on every desktop and Microsoft Windows on every PC". Not by a long shot.