I've had exactly the same problem with the Sony T1 - I already had a collection of multi-cables for charging various devices, which included micro-USB cables. All of these charged the T1, either through a wall charger or the PC, without any problem, but the device didn't show up on the PC and I couldn't transfer data. That was fine - I'd bought them as charging cables, and so I assumed that a data transfer cable must be be different. However, in the past week, I've bought two micro-USB cables that claimed not only to be data transfer cables, but to be specific for the T1, and neither worked. So like you, I'm rather bemused by this.
Both of these new cables were thicker than the multi-'charging' cables, and looked exactly like the original Sony cable. In both cases, when I plugged the Sony into the PC, I got the message about whether I wanted to transfer data, but before I could press it, the screen started to flash and another message popped up to say it wasn't charging. Same thing happened with different USB ports and different computers, and when I tried the cables with the wall charger, the light on the Sony didn't come on, but it did immediately with one of the multi-cables. So it does seem there's some difference somewhere.
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