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by simonh 2889 days ago
It wasn't a last minute change of direction, they had about a year to put the DK and app store together. I believe the final decision was made shortly after SDC in 2007.

They couldn't have released an SDK in 2007 though, it simply didn't exist every system app was essentially put together by hand as part of the system and debugged and tested alongside the OS. At least that's what it sounds like from the interviews I've seen with developers on the project.