As CIO I started phasing out XP in 2010. Any reasonable office desktop hardware purchased in the last 5 years will run 7 or 8 with a minimum of fuss. The last hold-outs got a 2nd Enterprise-grade HD with Windows 8 deployed and a dual-boot setup, and they have 30 days to get their data migration done before the network will no longer recognize their login. As an administrator it is my job to make decisions that maintain the productivity and security of the corporate infrastructure. I deploy Windows, Solaris, Linux, Unix, all of which have their place in a productive environment.