Where MIcrosoft will win is when enterprises start replacing the Windows desktops and laptops with tablets.....but it will take a few years for them to begin reaping the benefits, but I do think as long as the tablets are compatible with the current desktop software, they will inevitably gain an advantage in the Enterprise tablet market.
Uh, you can’t do data entry on a tablet, so I suspect that the enterprises are buying them for other purposes, such as for example conducting meetings (a huge semi-secret market segment, as corporate managers live and breathe meetings and just love to show off, so that tablets, like RIM phones before them, become status symbols and power accessories like pink neckties!)