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The Synchronize method is called by Messaging to place a synchronize request with the transport.


HRESULT Synchronize (


  • pRqst
    [in] Reference to a MAILSYNCREQUEST structure that defines what to synchronize. If NULL, the transport should do a full synchronization.

Return Values

This method returns the standard values E_INVALIDARG, E_OUTOFMEMORY, E_UNEXPECTED, and E_FAIL, as well as the following:

  • S_OK
    Indicates success.


While synchronizing, if the transport encounters an error event, it should use IMailSyncCallBack::LogEvent to log it with Messaging. If the error condition is catastrophic, the transport should stop synchronizing. Otherwise, it should continue with the rest of the synchronization.


Pocket PC: Pocket PC 2002 and later
Smartphone: Smartphone 2002 and later
OS Versions: Windows CE 3.0 and later
Header: cemapi.h
Library: cemapi.lib

See Also

IMailSyncHandler | Messaging

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