There is still a lot of XP Clients around. Many Companies are doing “last minute” migrations these days. In System Center 2012, R2 Configuration Manager there is a bug that prevents you from deploying Windows 8.1 to a Windows XP-based computer.
Deployment fails, SMSTS.LOG show: “TSManager datetime 3048 (0x0BE8)”.
Microsoft has released a hotfix, get it here: http://support.microsoft.com/kb/2910552