Since SMS 2003 days, we’re using CCMClean.exe to uninstall or remove the client components. Removing/uninstalling SCCM 2007 or 2012 clients using CCMClean.exe is not supported  by Microsoft. “Not supported by Microsoft” !! So, what does that mean ? Well, it’s not tested (extensively) and certified by Microsoft for the products ConfigMgr 2007/2012. However, it may or may not work. Read Full Post @ http://anoopcnair.com/2012/06/11/configmgr-sccm-2012-uninstallremove-cm-2012-client-using-ccmclean-exe/