Yet more on Sidekick
Here's an AppleInsider article that claims to have information from inside Danger and Microsoft.
Additional insiders have stepped forward to shed more light into Microsoft's troubled acquisition of Danger, its beleaguered Pink Project, and what has become one of the most high profile Information Technology disasters in recent memory.
The sources point to longstanding management issues, a culture of "dogfooding" (to eradicate any vestiges of competitor's technologies after an acquisition), and evidence that could suggest the failure was the result of a deliberate act of sabotage.
Hanlon's Razor still applies, though; stupidity is more likely than sabotage in my opinion.