Late enough to miss the market window, delivered only a fraction of the promised features, less than the Danger Sidekick which it was supposed to build upon.

The official Windows phone unit was doing its best to kill the Kin, it had to switch to Windows CE, it was required to support Exchange, and a lot of the code supplied to the Kin group, especially for Exchange, was in horrible shape.

Ah, and another example of this sort of bad Microsoft behavior: When they bought Danger, they ignored its contractual responsibilities to T-Mobile and expected to immediately repurpose Danger's technical employees. Oops, T-Mobile refused to put up with that, and those employees had to spend some time developing the last Sidekick models (and all this had a morale crushing effect, above and beyond that of being absorbed by Microsoft with its stack ranking el. al.).