I'll have to check that out tomorrow (its at the office). But that would explain a lot....If you look at a dock it has no micro USB connector.
UPDATE: You were 100% correct. The Dock has no micro USB port at all. So MS is powering the S3 in the dock via some other mechanism (which I assume is the full size USB port). However it works, it definitely charges faster than the external Micro USB adapter.
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