To enter, you must do all of the following:
Once logged into your Twitter account, follow the links and instructions to become a follower of @KnowMSN at http://twitter.com/knowmsn.
On the day of the Sweepstakes, an official tweet will be posted from the @KnowMSN handle, prompting you to take a specific action to enter using the hashtag #MSNChallenge. You have until the end of the Entry Period to retweet this tweet and receive a Sweepstakes entry.
You must remain a follower until at least June 30, 2013 in order to be contacted if you are selected as a potential winner.
Limit of one (1) entry per entrant or Twitter ID. We are not responsible for entries that we do not receive for any reason, or for entries that we receive but are not decipherable for any reason.
We will automatically disqualify:
Any incomplete or illegible entry; and
Any entries that we receive from you that are in excess of the entry limit described above.
Any entry that contains profanity and/or is deemed defamatory.
On or about May 29, 2013, and every Wednesday thereafter until June 26, 2013, we will randomly select (1) winner, from among all eligible entries received during the above stated Entry Period, of the prize designated below.
Prizes:
(5) Each winner from May 29 – June 19 will receive a $250 Microsoft Store gift card redeemable online only.
(1) The winner selected on June 26 will win one a $600 Microsoft Store gift card redeemable online only.
http://www.bing.com/blogs/site_blogs/b/thedetails/archive/2013/05/21/microsoft-msn-msnchallenge-twitter-sweepstakes.aspx