ActiveSyncStart

If successful, this method returns S_OK. An error code indicates failure.

This is a device-side method. It can be called from applications running on a Windows Embedded CE–based device. This method cannot be called from a desktop application.

When synchronization commences, all data sources present on the device will be synchronized according to the ActiveSync application settings. This function starts synchronization but returns immediately and does not wait for synchronization to complete.

Reference