IMAPISync : IUnknown

Office 2013 and later

Last modified: June 25, 2012

Applies to: Outlook

Provides a mechanism for synchronizing email instead of using the Transport API. This interface is exposed on a store object. By using this interface and IMAPISyncProgressCallback : IUnknown, a transport provider can provide better progress and error messages than those that appear in the Send/Receive dialog in Microsoft Outlook.

The outbox is still in the default store. Outlook will continue to use the Transport APIs to send mail because the outgoing message cannot be in the external store.

Exposed by:

Store and transport providers

Implemented by:


Called by:

Store and Transport providers

Interface identifier:



Implemented by message store providers. This method is called by Outlook 2010 and Outlook 2013 to start synchronization.