sends this excerpt from PCMag:
"Microsoft this week admitted that its upcoming Surface tablet might hurt its relationships with PC maker partners. As first noted by the New York Times, Redmond said in a Thursday filing with the Securities and Exchange Commission that 'our Surface devices will compete with products made by our OEM partners, which may affect their commitment to our platform.'"
also made note of the difficulties in building up another app marketplace: "In order to compete, we must successfully enlist developers to write applications for our marketplace and ensure that these applications have high quality, customer appeal and value. Efforts to compete with these application marketplaces may increase our cost of revenue and lower our operating margins."