XFOR: Embedded Messages not Handled by MS Mail Connector

Article translations Article translations
Article ID: 157420 - View products that this article applies to.
This article was previously published under Q157420
This article has been archived. It is offered "as is" and will no longer be updated.
Expand all | Collapse all


If a message that has an embedded MAPI attachment is forwarded or sent directly to a Microsoft Mail recipient by means of the Microsoft Mail Connector, the attachment will not be visible to the MS Mail user. The user may see text that resembles the following:
[[ MAPI 1.0 embedded message : 4663 In winmail.dat ]]
or possibly just the <Attachmentname.extension>:




It is possible to convert the embedded message to text format so it will be visible by a Microsoft Mail client. Note that this will not occur with any Microsoft Exchange client accessing an Microsoft Mail postoffice, and the following registry value will not be required.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows 95. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.
  1. On the Microsoft Exchange Server, start Regedt32.exe.
  2. Under the HKEY_LOCAL_MACHINE subtree, go to the following subkey:
  3. On the Edit menu, click Add Value.
  4. As the Value Name, type:
          Non-MAPI Embedded Messages
  5. Select REG_DWORD as the Data Type.
  6. Click OK.
  7. Type 1 (the numeral one) in the Data field, and make sure you click Hex in the Radix field.
  8. Click OK.
  9. Stop and restart the Microsoft Mail Connector Interchange service.
This registry modification will allow MAPI embedded messages to be transmitted to the Microsoft Mail system in text format.


Article ID: 157420 - Last Review: October 26, 2013 - Revision: 4.0
Applies to
  • Microsoft Exchange Server 4.0 Standard Edition
  • Microsoft Exchange Server 5.0 Standard Edition
  • Microsoft Exchange Server 5.5 Standard Edition
kbnosurvey kbarchive kbprb kbusage KB157420

Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from smallbusiness.support.microsoft.com