There are many reasons to be excited about Windows Phone 7, but a bleak spot has been Microsoft's message -- or lack thereof -- on user-expandable storage, and the situation finally came to a head last week when AT&T told Samsung Focus owners to hold off on buying microSD cards altogether until Microsoft had a chance to certify some for use with the platform. How did it get to this point? Why wasn't it communicated to users that this was such a problem before the phones ever went on sale? And if it really
