Microsoft and Dropbox announced a new partnership, that was somewhat surprising to say the least. This means the following –

Dropbox and Microsoft users can now do the following:

Access Dropbox from Office apps to get to their files and folders faster.

Edit Office files directly from Dropbox and sync them across devices.

Share new or edited files from the Office apps using simple Dropbox sharing functionality.

The functionality will first be included in the next updates to the Office apps for iOS and Android, coming in the next few weeks. The Web integrations between the Dropbox website and Office Online will be available in the first half of 2015. Dropbox will also make its application available on the Windows Phone and Windows tablet platforms in the coming months.

These capabilities will be available to all Office users with a Dropbox account. Dropbox for Business customers will need an Office 365 subscription. More information can be found by visiting the Dropbox blog at https://blog.dropbox.com/2014/11/dropbox-microsoft-office-partnership and the Office blog at http://blogs.office.com.

Via – http://news.microsoft.com/2014/11/04/microsoft-and-dropbox-announce-strategic-partnership-to-give-people-more-freedom-in-how-they-work-2/