Yesterday was Microsoft's BUILD conference. I wasn't expecting anything of much interest to come out of it, since I'm not a Windows developer, nor use any Microsoft services on a regular basis. One of their announcements really surprised me, however, and has me waiting in anticipation: Linux syscall emulation in the Windows kernel.

Firstly, I need to confess. For the majority of the month of February this year I ran Windows 10 Pro as my primary operating system. Through a combination of HyperV, Putty, and a little Samba magic I had a fairly reasonable development environment on Windows using Debian Stable. I used this setup at work doing real things for an entire month, and no one noticed. My productivity was not hampered and I got to reap the benefits of a real desktop OS. Eventually I gave up, since the performance constraints of a VM on an ultrabook using networked filesystems just wasn't cutting it, and reinstalled Fedora which I am still using now.

I do miss using Windows as an OS, however. Things just worked, and everything had a cohesive design language. No longer did I have to cringe at Linux GUIs, worry that plugging in a monitor would crash my desktop environment, or be afraid to plug in a USB DAC in fear that it would randomly set the volume to 100%. I only use Linux on the desktop for its tools; the "desktop" part has never been a strength.

In the past I have often lamented that, "If only I could get Windows with a UNIX userland, it would be perfect." Well, here we are.

This isn't to say I'm going to wipe every machine I own immediately — it has yet to be seen if this emulation is performant, stable, or compatible with anything more than the limited demo of "wow we ran webrick and ls". Real-world testing with real applications and large, complex software will be the tell-tale sign whether this is viable or just a cool trick.

And, obviously, this being Microsoft, there is likely some evil business reason for this new Linux push they've been doing. I'd be a fool for not questioning their motives in abandoning vendor lock-in and embracing their competition. But I'm willing to take that risk; Windows 10 is surprisingly pleasant to use, but it's still Windows and not the friendliest development platform unless you're Microsoft all the way down.

I am also hoping other vendors and projects see this as an opportunity. Specifically, I'd love to see RedHat step up and provide a similar kernel-less package for the Fedora userland so we could have more than just Ubuntu and its mediocrity.


Linux on the Desktop, while it has been improving, is still just not quite there yet. Linux emulation on Windows might be a nice middle-ground between the buying power of a giant company and the familiarity and power of a UNIX userland… It sounds a lot like what OS X used to be.

And that is what I believe Microsoft is going after: burnt-out OS X users. I know a lot of computer "power users" who have been endlessly frustrated with the recent decline of Apple software quality, and a lot of them have been eyeing (or have already switched) to Linux. If, when I originally made the switch back to Linux, I was offered Windows with a Linux userland, I would have likely taken it instead (in fact, there was a brief period where I switched to a Windows 8.1 machine and an EC2 instance as my development environment, but ultimately went back to Linux).

If Microsoft wants to expand into being the new “Unix OS for Professionals” I am all for it. With OS X rotting from the inside-out, there is a gap in the UNIX desktop market and if that's what Microsoft is targeting I think they could do very well.

Am I skeptical? Yes. Am I also hopeful? Absolutely.