DOCUMENT:Q293218  23-OCT-2001  [exchange]
TITLE   :XWEB: "Failed to Create MAPI.Session" Error Message in OWA
PRODUCT :Microsoft Exchange
PROD/VER::5.5
OPER/SYS:
KEYWORDS:

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The information in this article applies to:

 - Microsoft Outlook Web Access, version 5.5 
 - Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

When you try to log on to Outlook Web Access (OWA), you may receive the
following error message in you browser:

   Internal error: failed to create MAPI.Session.

When you click OK, you return to the OWA logon page.

CAUSE
=====

This issue can occur if the Cdo.dll Collaboration Data Objects library is not
properly registered.

RESOLUTION
==========

To resolve this issue, reregister the Cdo.dll library by typing the following
syntax at a command prompt:

   "regsvr32 c:\winnt\system32\cdo.dll" (without the quotation marks)

After you run this command, you receive the following confirmation message from
RegSvr32:

   DllRegisterServer in Cdo.dll succeeded



Additional query words: logon.asp Active Server Pages internal error mapi.session

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Keywords          :  
Technology        : kbOutlookSearch kbExchangeSearch kbExchange550 kbZNotKeyword2 kbOWASearch kbOWA550
Version           : :5.5
Issue type        : kbprb

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