The company initially released protection against improper certificates issued by the French government certificate authority without support for XP and Server 2003, but have now come through.



From ZDNet:

Initially, Microsoft released countermeasures to protect users against any potential effects of these certificates —although none have been reported and the problem seems to have been contained — but they only released that protection for devices running supported editions of Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, and Windows Phone 8 — not for Windows XP or Windows Server 2003. All support for Windows XP will end after Patch Tuesday this coming April, 2014. Support for Windows Server 2003 will extend into 2015.

  Microsoft releases certificate spoof fix for Windows XP, Server 2003