I have downloaded & installed M$ Office 2007 Ultimate MSDN untouched edition on M$ Windows XP OS, & when I launch an office product, it request activation !? A friend of mine told me that he has successfully installed an M$ Office 2007 Enterprise edition MSDN untouched edition, & it never requested activation for him ! I am wondering what should I do to activate my M$ Office 2007 Ultimate, & if it is not possible, then should I download the Enterprise edition ? or the professional plus one !?!?!? Help me please, I am really confused with office editions. Thank you for your understanding.