http://www.theverge.com/2014/11/6/71637 ... ne-android
The move comes just days after Microsoft announced a strategic partnership with Dropbox to integrate the cloud storage service into Office across desktop, mobile, and the web.
You can now download Office for iPad and store all your documents on Dropbox without paying Microsoft anything at all.
Microsoft is also releasing a brand new iPhone app today, alongside a preview of Office for Android tablets, all with Dropbox integration.