In the short term and even medium term, it is very likely that mainstream business customers will be more comfortable viewing the cloud as an add-on to rather than a replacement for their traditional Office programs. The competitive battle, in other words, will be fought largely on Microsoft's turf, and on that turf a certain amount of messiness is both allowed and expected. "Google and other Office competitors will be breathing a sigh of relief this morning," writes Mike Arrington. If so, it's a sigh they may come to regret.