I would say the second one. However, the first one is more often used in a formal context: from one business to another. ]
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YankeeHi pleasehelp
There isn't any difference in meaning. However, I've always thought that using the continuous form seemed a little friendlier and/or warmer than the simple form. The simple form has always struck me as a little bit cooler and/or distant, and thus a bit more formal. That seems to be pretty much the same way Philip reacts to the two versions.