Looks like the statement “SMS 2003 does not support Windows 7” isn’t valid anymore. Through an internal e-mail I learned that Microsoft has released a Compatibility Pack for SMS 2003 that adds Windows 7 and Server 2008 R2 as supported clients. However don’t get too excited, if you want to benefit from OS deployment features, you still need SCCM 2007. Also note that that Mainstream support for SMS 2003 ended on January 12,2010.