It's not every day you see Microsoft
The company's official Windows Store will be the exclusive distribution outlet for new "Metro" styled apps, similar to Apple's iOS App Store. The reasons behind the decision align with Apple's interest in providing a safe environment with certain quality standards -- cue fart-app comments now -- regarding what content is available on the platform, although Apple's self-appointed curator role has drawn its own criticisms. Similarly, Microsoft plans on taking an Apple-esque 30% cut of Metro app sales, while desktop apps avoid the fee.
Traditional desktop-app dissemination will remain unchanged, while Metro apps will require Microsoft's approval stamp before seeing the light of day. As a longtime user of iOS, I think the overall benefits of security outweigh the costs of Cupertino's sometimes-fickle rules over what does or doesn't fly, which typically only affects a relatively small fraction of apps.
Microsoft would differ from Google's
Apple's tried-and-tested approach has been largely successful, especially for developers. A recent study conducted by Piper Jaffray's longtime Apple analyst Gene Munster concluded that iOS users buy more apps and are willing to pay more for apps than their Android counterparts are. Although Munster doesn't attribute the difference directly to Apple's policies, it's no stretch of the imagination to venture that consumers are more willing to open up their wallets if they feel that they're in a safe environment.
Microsoft is making the right move by following in Apple's footsteps here. Android has had plenty of criticism over fragmentation, with multiple storefronts only adding fodder to the argument. By providing a single channel for developers to congregate and sell their digital wares for Windows 8, Microsoft is setting them up for success, and any platform's fate rests squarely in the hands of its developers.