Outlook 2016 mapi.MAPIUninitialize() crashes

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  Hi,
  
  In my multi threaded application where multiple threads do mapi initialize by
  mapi.MAPIInitialize((0, mapi.MAPI_MULTITHREAD_NOTIFICATIONS))
  
  mapi.MAPIUninitialize() crashes.
  
  I got the following call stack from windbg.
  
  mso30win32client!Ordinal250+0x32423
  mso30win32client!Ordinal126+0x5b
  mso30win32client!Ordinal1337+0x39d
  mso30win32client!Ordinal1470+0x17e
  mso30win32client!Ordinal1470+0xe
  mso40uiwin32client!Ordinal2408+0x19
  olmapi32!LINKEDLIST_RemoveKey+0x4e6
  olmapi32!HrUninitMso+0x36
  olmapi32!MAPIUninitialize+0x9
  MSMAPI32!MAPIUninitialize+0x42
  MAPI32!MAPIUninitialize+0x5b
  mapi+0x11d9 
  
  Each thread does only following mapi calls in sequence :
  1 MAPIInitialize,
  2 MAPIAdminProfiles,
  3 HrQueryAllRows,
  4 session=MAPILogonEx,
  5 session.logoff,
  6 MAPIUninitialize
  
  Observation:
  If there are two threads T1 and T2 .
  T1 logs in to session prior to T2 and T1 does MAPIUninitialize after T2 it dont lead to crash, 
  But if T1 logs in to session prior to T2 and T1 does MAPIUninitialize before T2 then call to MAPIUninitialize leads to crash with above stack.
  
  PS : Crash occurs with Outlook 2016 only and works fine with Outlook 2013 and prior.

  • Moved by Dave PatrickMVP Tuesday, December 1, 2015 6:22 AM

  Tuesday, December 1, 2015 5:56 AM