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Microsoft KB Archive/252720

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Knowledge Base

MAPI and CDO are not supported in Outlook IMO mode

Article ID: 252720

Article Last Modified on 8/25/2005


  • Microsoft Messaging Application Programming Interface
  • Microsoft Collaboration Data Objects 1.21
  • Microsoft Collaboration Data Objects 1.2
  • Microsoft Collaboration Data Objects 1.1
  • Microsoft Outlook 2000 Standard Edition
  • Microsoft Outlook 98 Standard Edition

This article was previously published under Q252720


You can install Microsoft Office Outlook in the following modes:

  • Internet Mail Only (IMO)
  • Corporate or Workgroup (CW)

A different MAPI subsystem is installed for each of these modes. The MAPI subsystem that is installed in the IMO mode is a stub that provides minimal MAPI support for the basic functionality of Outlook.

Outlook must be installed in the CW mode to provide full support for the following technologies:

  • Extended MAPI
  • Simple MAPI
  • Collaboration Data Objects 1.2x (CDO)
  • Exchange Developer's Kit (EDK)
  • MAPI Controls

Programs that use these technologies can run on systems where Microsoft Outlook is installed in the IMO mode, but this mode is not supported.


You can switch modes from IMO to CW. For more information about switching modes, click the following article number to view the article in the Microsoft Knowledge Base:

195507 How to switch from one installation type to another in Outlook 2000


For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

196041 How to know what type of Outlook Setup options that you are using

195507 How to switch from one installation type to another in Outlook 2000

183524 Switching from one installation type to another

Keywords: kbinfo kbmsg KB252720