Microsoft has received much undeserved press about their recent release of Linux drivers for their virtualization technology under GPLv2. I say “undeserved” because I don't particularly see why Microsoft should be lauded merely for doing something that is in their own interest that they've done before.
Most people have forgotten that Microsoft once had a GPL-based product available for Windows NT. It was called Windows Services for UNIX, and AFAICT, remains available today (although perhaps they've transitioned in recent years to no longer include GPL'd software).