Meet Microsoft Open Technologies Inc., the new open-source subsidiary for MS
thenextweb.com
thenextweb.com
And this is perfectly fine. For instance, Qualcomm set up Code Aurora specifically so that they could keep their propriety and open source offerings separate.
The shifty thing here is that Microsoft is trying to paint this as some sort of altruism, as thought Microsoft is doing the open source world a favor by setting up a legal formality.