Windows is still being supported -- just not Windows XP. Linux is only supported as far back as version 2.6, and that support is similarly ending soon. Linux 2.

Windows is still being supported -- just not Windows XP. Linux is only supported as far back as version 2.6, and that support is similarly ending soon. Linux 2.4, which was released around the same time as XP, is no longer supported. I'm not sure how it follows from Linux's history that Windows XP should be open sourced.