How to disable OneSyncSvc_c523d on Win10?

The easy way to disable the OneSync service (and it's mirror) is to use the Registry.

Press Windows, type regedit and press Enter.
Click Yes in the UAC dialog.
Navigate to Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\OneSyncSvc_c523d. N.B. MS may change the suffix for that key, so look for OneSyncSvc_, knowing the last few characters may differ.
Change the value in Start to 4, which means "disabled". N.B. if you are not an Administrator, or if the key is owned by TrustedInstaller, you may need to change owner and permissions on the key OneSyncSvc_c523d and its subkeys.

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