Microsoft's Android tablet versions of Word, Excel, and Powerpoint are no longer in preview mode; you'll be able to download them today. As with the iOS apps launched last year, Office is essentially free to use on Android for most consumers, though certain premium features and business functionality require an Office 365 subscription. The preview program covered more than 3,000 variants of 500 separate Android devices, and native support for Intel processors is coming later in the year.

Microsoft says the iPhone and iPad versions of Office have been downloaded more than 80 million times worldwide. Although the free release on competing platforms represents a major change in strategy, it's all part of CEO Satya Nadella's plan to put the company's services on the most popular devices — whether they run a Microsoft OS or not. Office 2016 is coming for Windows later this year, however, and a new touch-friendly version will be included with Windows 10 for phones and small tablets.