Actually, that was only the case temporarily. For ...reasons... (I think it was the SkyDrive legal complaint?) the product rename happened before the client was

Actually, that was only the case temporarily. For ...reasons... (I think it was the SkyDrive legal complaint?) the product rename happened before the client was technically consolidated. Since January, OneDrive and OneDrive for Business use the same client and (on o365/SP16FP1) the same infrastructure & API. If you're using the old ODFB client that was bundled with old versions of Office, you should upgrade. The old ODFB was terrible, and MS has been trying to get rid of it for years. (If you're using an old version of SharePoint 2013/2016 to host OneDrive locally, you should probably patch that too.) The new client is OK. But it's too late for me. MS have burnt me so many times with OneDrive/SkyDrive/Mesh/Windows Live/FolderSync at this point that I'm now an avowed Dropbox/Resilio user, and I won't be looking back for many years. A similar consolidation will be happening with the new Skype/Skype for Business clients. They broke my TV's skype camera to make that happen, and it's still not happening. I've switched to Hangouts/FB Messenger. The main reason these transitions are taking so long is: (a) all the on-premises customers create backwards compatibility hell (b) complete confusion around authentication and (c) they doesn't seem to be very good at delivering good software. The "OneDrive app" is a Windows 10 app store app, similar to the iOS and Android apps.