Q268272: CDO MAPI Session Logon Fails If No Thread Token

Article: Q268272
Product(s): Microsoft Exchange
Version(s): 1.2,1.21,5.5
Operating System(s): 
Keyword(s): kbDSupport kbExchange550sp4Fix
Last Modified: 08-MAY-2002

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The information in this article applies to:

- Microsoft Exchange Server, version 5.5 
- Microsoft Outlook 2000 
- Collaboration Data Objects (CDO), versions 1.2, 1.21, used with:
   - the operating system: Microsoft Windows 2000 
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SYMPTOMS
========

On Windows 2000, when an ActiveX EXE using CDO 1.2x creates a MAPI Session
object and then calls the Logon method, the Logon method can return
MAPI_E_LOGON_FAILED when the ActiveX EXE's identity is configured (under
DCOMCNFG) to run under a specific user. If the ActiveX EXE is configured to run
under the "interactive user" then it works fine and the Logon succeeds. The
exact same application runs properly on a Windows NT 4.0 server.

CAUSE
=====

A MAPI Session Logon call from a thread needs the ThreadToken set.


RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server 5.5.
For additional information, please see the following article in the Microsoft
Knowledge Base:

  Q191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or
later:

+-------------------------+
| File name | Version     | 
+-------------------------+
| CDO.dll   | 5.5.2652.75 | 
+-------------------------+


STATUS
======

Microsoft has confirmed this to be a problem in CDO version 1.21. This problem
was first corrected in Exchange Server 5.5 Service Pack 4.


Additional query words:

======================================================================
Keywords          : kbDSupport kbExchange550sp4Fix 
Technology        : kbOutlookSearch kbAudDeveloper kbCDOsearch kbExchangeSearch kbZNotKeyword2 kbOutlook2000Search kbZNotKeyword3
Version           : :1.2,1.21,5.5
Issue type        : kbbug
Solution Type     : kbfix

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