Some MAPI Constants

[This is now documented here: ]

Dmitry pointed out that some time in the last couple MAPI documentation refreshes, we added documentation for a few interfaces but forgot to define their associated guids. We’ve got a bug tracking this and plan to fix it in a future reference, but in the mean time, here are the constants we’ve identified so far as missing.

// IMAPISync
DEFINE_GUID(IID_IMAPISync, 0x5024a385, 0x2d44, 0x486a,  0x81, 0xa8, 0x8f, 0xe, 0xcb, 0x60, 0x71, 0xdd);

// IMAPISyncProgressCallback
DEFINE_GUID(IID_IMAPISyncProgressCallback, 0x5024a386, 0x2d44, 0x486a,  0x81, 0xa8, 0x8f, 0xe, 0xcb, 0x60, 0x71, 0xdd);

// IMAPISecureMessage
DEFINE_GUID(IID_IMAPISecureMessage, 0x253cc320, 0xeab6, 0x11d0, 0x82, 0x22, 0, 0x60, 0x97, 0x93, 0x87, 0xea);

// IMAPIGetSession
DEFINE_GUID(IID_IMAPIGetSession, 0x614ab435, 0x491d, 0x4f5b, 0xa8, 0xb4, 0x60, 0xeb, 0x3, 0x10, 0x30, 0xc6);

Please let me know if you uncover any other constants which we left out.


Comments (7)

  1. SvenC says:

    Hi Steve,

    just tried to QI on an IMsgStore in an Outlook 2010 COM-Addin for IMAPISync and got E_NOINTERFACE. This is my GUID definition which looks identical to yours:





     0x81, 0xa8, 0x8f, 0x0e, 0xcb, 0x60, 0x71, 0xdd);

    The store is my default mailbox store, connected online with Exchange 2010 SP1.

    Should that store implement that interface?



  2. Stephen Griffin says:

    The Exchange and PST providers do not implement that interface. That documentation was intended for a store provider developer to implement the interface. Outlook will use the interface if it finds it.

  3. Sergey.Muravjev says:

    Hi Steve!

    What about Outlook 2003 and Outlook 2007, will they use IMAPISync?

    Thank you,


  4. Stephen Griffin says:

    No – 2010 only.

  5. Sergey.Muravjev says:

    How we can reflect the synchronization progress in the Outlook 2003 or Outlook 2007?

  6. Chuck Bohling says:


    I just posted a question on the outlook developer's forum about trying to use IMAPIGetSession. It's not working for me. I get an E_NOINTERFACE back from IMAPISupport::QueryInterface. Any thoughts on what I'm doing wrong? Here's the forum link.…/72659d02-6f87-474d-a36f-6d2279b925ee



  7. Stephen Griffin says:

    Closing the loop, IID_IMAPIGetSession is only available on the support object passed to transport providers via TransportLogon. It is not available to address book or message store providers.