Microsoft made available the first version of Windows Vista SP1 to a limited pool of testers back in mid July 2007. The Redmond company is preparing to offer free Windows Vista Ultimate Service Pack 1 Beta DVDs, along with the product keys necessary to activate the platform, in order to support a veritable Vista SP1 install bonanza. Of course, it involves the first service pack for the operating system. Microsoft is cooking up a little surprise for Windows Vista users.