Sync Host - Windows 11 Service
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.
This service also exists in Windows 10.
Startup Type
| Windows 11 version | Home | Pro | Education | Enterprise |
|---|---|---|---|---|
| 21H2 | Automatic | Automatic | Automatic | Automatic |
| 22H2 | Automatic | Automatic | Automatic | Automatic |
| 23H2 | Automatic | Automatic | Automatic | Automatic |
| 24H2 | Automatic | Automatic | Automatic | Automatic |
Default Properties
| Display name: | Sync Host |
| Service name: | OneSyncSvc |
| Type: | user share process template |
| Path: | %WinDir%\system32\svchost.exe -k UnistackSvcGroup |
| File: | %WinDir%\System32\APHostService.dll |
| Error control: | ignore |
Default Behavior
If Sync Host fails to load or initialize, Windows 11 start up proceeds. No warning is displayed, but the error is recorded into the Event Log.
Restore Default Startup Type for Sync Host
Automated Restore
1. Select your Windows 11 edition and release, and then click on the Download button below.
2. Save the RestoreSyncHostWindows11.bat file to any folder on a local drive such as SSD or a hard disk.
3. Right-click the downloaded batch file and select Properties.
4. Check the Unblock checkbox and click OK.
5. Right-click the batch file again and select Run as administrator.
6. Restart the computer to save changes.
Note. Make sure that the APHostService.dll file exists in the %WinDir%\System32 folder. If this file is missing you can try to restore it from your Windows 11 installation media.