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MAPI and CDO are not supported in Outlook IMO mode

Summary
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.
More information
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
References
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
Properties

Article ID: 252720 - Last Review: 06/19/2014 07:03:00 - Revision: 5.0

  • Microsoft Messaging Application Programming Interface
  • Microsoft Outlook 2000 Standard Edition
  • Microsoft Outlook 98 Standard Edition
  • kbinfo kbmsg KB252720
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