There is about a million things on that showing that it's a scam but probably the most obvious is the e-mail address you are meant to contact

johnmartins_claimsagent14@yahoo.com.hk

Yahoo.com.hk lol and this is meant to be a microsoft employee.

If win a competition that you havn't entered then it's almost always a scam especially when it's Microsoft giving away almost a quarter of a billion dollars for no reason at all.