I have installed one of the corp editions of XP pro. this is what microsoft says about the key used to install it. I have been installing a few different versions with different keys just to see what happens, and this one is supposed to be corp edition. But i do find this interesting. The first 5 digits of this (Corp) install are DP2RT, and its apparently a blacklisted key......I just thought it would be fun to try this, and let you all know.