HTC’s flagship Windows Phone 7 device, the HD2-succeeding HD7, does indeed have a microSD slot which is located right next to the SIM holder, according to Arne Hess from the::unwired. Unfortunately, unlike the Samsung Focus, this card is not meant to be swapped out, claims Hess. Instead, the included card (8GB in Europe and 16GB everywhere else) is impossible to remove without some warranty-voiding phone disassembly — and even then, asserts Hess, any attempt to replace it will trigger an error message.
The issue of storage capacity in Windows Phone 7 has been one of some contention ever since it was revealed that launch devices would not suppport user-accessible memory expansion. This was further compounded when Europeans learned that many of their allocated handsets would only contain 8GB of flash memory, which in the case of the HD7, is just half of the 16GB that will be enjoyed by American T-Mobile customers.
We did find that swapping out memory was possible on our Samsung Focus review unit, although the results were a little wonky and the phone required a hard reset, making this operation somewhat undesirable to repeat. On the plus side, you can jack the Focus up to 40GB of total memory in this manner, a very healthy amount compared to capacious competing devices like the iPhone 4 and Nokia N8.