It is either an auction with a low starting price, since the URL has "bidding" in it, or it is not genuine. In any event, go here for Office:
http://social.answers.microsoft.com/Forums/en-US/category/officestart
You're off topic for this forum, which is dedicated to
Windows Live OneCare.
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~