Hi BigGoofyGuy,
Those articles really don't say much, and to me suggest it would not be MS-Windows if it was open sourced but more likely a different O/S what ever it might be called, as it would need to be started from scratch.
Yes, it might have large chunks of current Windows code and API's but as with OS/2, much would need to be rebuild from the ground up, so a new O/S.
A lot of investment there, can Microsoft see its future in that direction ? Possibly but I don't think it's current work force is geared up for that in a major way.
Microsoft's current Open Sourced projects are islands unto themselves, with many easy to turn over to Open Source simply because they were easy to fence off legally and code wise compared to some of Microsoft's bigger projects.
The main reason IBM didn't, couldn't, and wouldn't open source OS/2 was because it was to hard, to expensive, and trying to figure out the mess left from some code owners that have vanished over the years (both personal and corporate), oh, and considering the amount of code copyrighted to Microsoft
It's just plain messy