The Windows XP Zombie Apocalypse

The clock has stopped ticking as far as the countdown to 'end of life' for Windows XP. As from today, Microsoft has officially pulled all support for the veteran operating system. That means no more software updates and, rather importantly, no more security updates. Depending upon which research you read, around one in five of all the computers on the planet are still running a version of Windows XP. If your enterprise is one of them, what does the future hold?