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
Path:%SystemRoot%\system32\svchost.exe -k UnistackSvcGroup
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\OneSyncSvc
  • 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 of Sync Host

1. Run the Command Prompt as an administrator.

2. Copy the commands below, paste them into the command window and press ENTER:

sc config OneSyncSvc start= auto
sc start OneSyncSvc

3. Close the command window and restart the computer.

The OneSyncSvc service is using the APHostService.dll file that is located in the C:\Windows\System32 directory. If the file is removed or corrupted, read this article to restore its original version from Windows 10 installation media.