Onedrive For Business always appears in the tray bar on a Windows 10 pc. It's already uninstalled in Control Panel and disabled at startup. Syncing has been paused.
However it keeps reappearing.
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OneDrive can be uninstalled from some versions of Windows 10:
Select the Start button, type Programs in the search box, and then select Add or remove programs in the list of results.
Under Apps & features, find and select Microsoft OneDrive, and then select Uninstall.
As OneDrive is built in to some versions of Windows and can't be uninstalled. As a workaround, you can hide it. Reference “Turn off or uninstall OneDrive” for detail steps: https://support.office.com/en-us/article/Turn-off-or-uninstall-OneDrive-f32a17ce-3336-40fe-9c38-6efb09f944b0
OneDrive for Business seems to be part of Office, not a separate application. To uninstall it:
(Note: The exact locations and wording may vary depending which version of Windows and Office you have installed)
Use Autoruns to disable it completely.
Type "onedrive" in the Filter field in the Everything tab, and uncheck all entries.