You're right, that's not the only issue. The "Windows Store" apps are limited to a specific subset of what we're accustomed to coming from Win32 and COM. Much o

You're right, that's not the only issue. The "Windows Store" apps are limited to a specific subset of what we're accustomed to coming from Win32 and COM. Much of this is designed to sandbox applications. So there's a new API and the new API is async all the way through. The async aspect gets a lot of attention because it's so pervasive, and can require some adapting. But you're right, the limited API can have a larger impact on a porting effort. BTW, my point about no database API is in reference to the lack of System.Data (ADO.NET). The assumption is that people are expected to consume data through Web services. It's great that SQLite supports WinRT, though. That definitely fills a big need.