According to Rolling Stone, Microsoft plans to roll out its digital music store on September 2. The store will reportedly offer 600,000 to 700,000 tracks for 99 cents apiece at launch. The publication also reports that Microsoft has made “several overtures” to Apple to make its songs compatible with the iPod but has been rebuffed. “With the ability to funnel 350 million users a month to the store via its Hotmail, Messenger and MSN sites, Microsoft will likely become the number-two player in the market for legally downloaded music and ultimately could challenge Apple’s reign at the top,” Rolling Stone says.