Microsoft and Dropbox today announced a "strategic partnership" to make life easier for people who use Office and Dropbox. In the next few weeks, the Office apps on iOS and Android will include integrated Dropbox support in order to provide direct access to Office documents stored on Dropbox. In early 2015, both Dropbox's Web interface and Office Online will support one another, enabling opening, editing, and sharing.
Microsoft may be making OneDrive ever more appealing by offering Office 365 users unlimited storage, but the company recognizes that Dropbox is for many people the cloud storage solution of choice today. Because of this, Dropbox is already the home to many Office documents—the company claims some 35 billion of them are stored on its platform—and the new integration should make working with those documents a bit easier.
Dropbox for Business users will have a similar featureset available, though they will need an Office 365 subscription to use it.
A Dropbox client for Windows Phone and Windows Metro is also under development and is expected to ship in the next few months.