Microsoft withdraws support for Windows Server 2003 on July 14, 2015. Hereís how you need to respond to protect your organizationís information assets. Just after enterprises have finished migrating their desktops from Microsoft Windows XP, they now have to turn around and move away from Windows Server 2003. The venerable (and now vulnerable) operating system reaches end of support on July 14, 2015. But many companies will continue to use the software after that deadline, and that has serious security implications.