The key is model N These ship with Ubuntu. The ones we purchased last year shipped with Free DOS. http://configure.dell.com/dellstore/config.aspx?oc=lo54702_n-series&model_id=optiplex-9010-n&c=ca&l=en&s=biz&cs=calca1 http://configure.dell.com/dellstore/config.aspx?oc=lo54711_n-series&model_id=optiplex-9010-n&c=ca&l=en&s=biz&cs=calca1 As I mentioned Friday, the BIOS is tweaked so OEM versions of Windows and Upgrade versions of Windows will not allow registration. Don Bosman Information Technologist MSU Libraries 366 W. Circle Drive - Rm.W441 East Lansing, MI 48824-1048 517-884-0873