title: How to pass msExchArchiveGUID to IMAPISession:OpenMsgStore to access Archive mailbox
body: <p>I am trying to access user's mailbox as well as archive mailbox using Outlook MAPI. Outlook version is 2013. User's mailbox and archive both are in O365 (Exchange Online)
  I am able to access users mailbox. However, access to users archive mailbox fails.
  I have user's email address and Archive GUID of the archive mailstore.
  Can someone please help me understand how to pass Archive GUID of user's mailbox to IMAPISession:OpenMsgStore.</p>
  
  <p>Thanks,
  Pranay</p>