DropBox missing from "Add a Place in Office 2016
In Office 2013 users had the ability to add non-Microsoft cloud storage providers (DropBox Google) to "Add a Place". This interoperability was a valuable asset to the user trying to use Office applications. In Office 2016 the ability to add DropBox is no longer available in the UI. The only options are Microsoft cloud stores.
this for 2010
Kevin Bouwman commented
And fix OneDrive; bring back the LiveMesh functionality and incorporate it in OneDrive. Take a look at Cubby DirectSync.