(Insert name here) Microsoft YouTube replacement

So its no secret that Microsoft has been trying to offer alternatives to other companies products. With the latest scuffle between Google and Microsoft perhaps a Microsoft run YouTube replacement isn't too far over the horizon. However Video sharing sites are extremely difficult to get people using. You must have a critical amount of users and posters.

So my question is: What do you think Microsoft would have to do to make there YouTube replacement a success?

Ps. Here's a mock up I made cause I was bored: