FORTUNE -- It may not sound quite as sexy as search, web browsers or mobile phones, but there's growing demand for moving all sorts of office applications to the cloud. That's why, Tuesday morning, Microsoft took the wraps off of its long-awaited Office 365, a suite of online productivity tools (and one of the worst-kept secrets in the industry). And it is enlisting big phone companies, which have had a sometimes uneasy relationship with Google, to help it get the tools in the hands of customers.
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