Sync Host (OneSyncSvc) Service Defaults in Windows 10

This service synchronizes mail, contacts, calendar and various other user data. Mail and other applications dependent on this functionality will not work properly when this service is not running.

Default Settings

Startup type:Automatic
Display name:Sync Host
Service name:OneSyncSvc
Service type:user share process template
Error control:ignore
Object:LocalSystem
Path:%SystemRoot%\system32\svchost.exe -k UnistackSvcGroup
File:%SystemRoot%\System32\APHostService.dll
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\OneSyncSvc
Privileges:
  • SeCreateGlobalPrivilege

Default Behavior

In Windows 10 it is starting automatically when the operating system starts. If Sync Host fails to load or initialize, Windows 10 start up proceeds without warnings. However the error details are being logged.

Restore Default Startup Configuration for Sync Host

1. Select your Windows 10 edition and release, and then click Download.

2. Save the Win10_OneSyncSvc_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The OneSyncSvc service is using the APHostService.dll file that is located in the %WinDir%\System32 folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.