A tipster had told BGR that the Sidekick, on T-Mobile and made by Microsoft-acquired subsidiary Danger, would be replaced by the Android-based forthcoming and rumored myTouch Slide, a myTouch 3G device with a sliding QWERTY keyboard made by HTC. Microsoft has yet to announce what will become of the Sidekick line, but hopefully the technologies from Danger could be integrated with Windows Mobile 7 or a potential Zune phone. Guess we’ll have to wait until Mobile World Congress next month to learn more. (via: BGR)
The T-Mobile Sidekick is an obsolete device.
The article says the sidekick will be replaced by a newer and different device, the myTouch Slide. I think this fooled the system because it can't read between the lines. 
( z1 device :mod ( z2 obsolete ) :domain ( z3 product :name ( z4 name :op "T-Mobile" :op "Sidekick" ) ) )