It's a brand-new version of the app that uses Microsoft's new APIs, and it probably part of a deal to get OneDrive to better use Apple's own file APIs on the Ma

It's a brand-new version of the app that uses Microsoft's new APIs, and it probably part of a deal to get OneDrive to better use Apple's own file APIs on the Mac and iOS. Maybe the rest of it is old and sucks but the file sync parts are all new.