This looks to me like typical Microsoft strategy that they utilized a lot 25 years ago.
1. when not leader in given market, make your product fully compatible with competitor
2. start gaining momentum (e.g. why should I use Linux, when on Windows I can run both Linux and Windows applications)
3. once becoming leader break up compatibility
4. rinse and repeat
Happened with MS-DOS, Word, Excel, Internet Explorer, and others.
Let's not call it Embrace, Extend, Extinguish until we see the Extend & Extinguish. Microsoft is a very different company than it used to be.
Based on what, exactly? That they opened part of .NET, except that it's only the web stack, and not the part everyone wants (WinForms)? That they released a reskinned version of the Atom editor? That they announced the release of a Linux version of SQL Server, except that it will be a simplified version, absent of the enterprise features? That they submitted C# to ECMA, as though this allowed anyone to port a realistic application to another platform, or that the world has any use for a closed-source language and compiler today? That they allow you to run Linux VM's in Azure, as though Azure could be competitive if they didn't?
Now this? I mean, sure, there are times I'm working in Visual Studio, and it would be convenient to use some shell commands like "cut" and "sort" without having to use Excel, but the implication of this announcement is that I'm going to do serious work with GNU tools under Windows? Like, I'm going to do Linux-type development work while being hamstrung by reboot every couple of days for the next someone-can-take-over-your-computer-by-looking-at-it-cross-eyed patch?
Maybe you haven't been in this business for 23 years, and haven't seen how many products Microsoft bought and spiked to make sure to keep their stranglehold on the ecosystem. (I'm still bitter about Groove.) Now Microsoft is on the precipice of being as irrelevant as the IBM they mocked 20 years ago, and these moves are only at attempt to extend their relevancy a little longer, but which don't actually mean anything.
You say Microsoft is different. If, by that, you mean that they're making a lot of moves that seem like desperate attempts to make people remember they exist in the post-PC era, then, yes, I agree. Until Microsoft releases Office and Exchange for Linux, they will never been seen as anything other than Gates'/Ballmer's Microsoft in my eyes. Office suites are hardly important any more, and lots of companies are just using Google apps instead of Exchange and AD, but that's the kind of move they'd have to make for me to take their "Microsoft Loves Linux" campaign seriously.
A solid majority of the people on the day side of the planet who are looking at a computer right now are looking at an Excel or Word document.
MS Office has 1.2 billion users [0] (and that probably doesn't include unlicensed users). That's pretty important.
Over half of my 25-year career has been involved with making applications to actually address the business need that people were working AROUND with Word and Excel. I can't complain; it's been a pretty good deal. I'm doing 2 side projects to replace Excel sheets with Rails apps right now. But with more and more "apps" on smartphones and web sites, on the low end, and gargantuan cloud apps like Evernote and Google apps, this space is going to continue to shrink.
The thing that probably won't die is friggin' PowerPoint. If I had a nickel for every slide I've had to look at...