Q247276: XFOR: Error Message: Extension MS Could Not Be Loaded

Article: Q247276
Product(s): Microsoft Exchange
Version(s): winnt:4.0,5.0,5.5
Operating System(s): 
Keyword(s): exc4 exc5 exc55
Last Modified: 06-AUG-2002

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The information in this article applies to:

- Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
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SYMPTOMS
========

When you use the Microsoft Exchange Server Administrator program to view the
properties of the Microsoft Mail Connector object in the Connections container,
the following error message may be displayed:

  Extension 'MS' could not be loaded.

CAUSE
=====

This issue can occur if any one of the three following conditions exists:

- The Add-Ins folder on the Exchange Server computer is not shared.

- Either the dynamic-link library (DLL) for the extension that is being loaded,
  Conadmin.dll, is the incorrect version or the Exchange Server directory
  version of the Conadmin.dll does not match the actual DLL file version.

- When you gain access to shares on a computer that is running Microsoft
  Windows NT Server from a Windows NT client and the IRPstackSize parameter is
  set too low on the server, you may receive the following error message:

  Not enough server storage is available to process this command

RESOLUTION
==========

The Add-Ins Folder on the Exchange Server Computer Is Not Shared
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To resolve this issue if the cause is the first condition in the "Cause" section
of this article, set the following correct shares and permissions for the
Add-ins subfolder:

  Share Name: Add-ins
  Path: \Exchsrvr\Add-ins
  Permissions:
<A0><A0><A0><A0><A0>Everyone: Read
<A0><A0><A0><A0><A0>Local Administrators Group: Full Control
<A0><A0><A0><A0><A0>Exchange Service Account: Full Control

If the Add-ins share is not set correctly, you should also check the other
default shares and permissions. For additional information, click the article
number below to view the article in the Microsoft Knowledge Base:

  Q147376 XADM: Names and Permissions of Exchange Server Shares

Incorrect Version DLL for Conadmin.dll or Mismatch with Exchange Server Directory Version of Conadmin.dll and DLL File Version
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To resolve this issue if the cause is the second condition in the "Cause" section
of this article:

1. Verify the build version that you are using. You can do this by checking the
  properties in the following location:

  Organization\Site\Configuration\Server\<server_name>

2. Check the actual file version of the file on the hard disk drive in the
  following location:

  Exchsrvr\Connect\Msmcon\Bin\Conadmin.dll

3. If the versions do not match, replace the file manually from the Exchange
  Server computer or Exchange Server service pack CD-ROM.

4. Verify the file version for the extension DLL. This can be done by checking
  the properties of:

  Organization\Site\Configuration\Add-Ins\Extension for MS Mail Connector for
  i386

5. If the file versions do not match, change the version in the directory by
  using the Exchange Server Administrator program in raw mode.

For additional information about how to change the value by using the
Administrator program in raw mode, click the article number below to view the
article in the Microsoft Knowledge Base:

  Q196924 XCON: Err Msg: Extension SMTP Could Not Be Loaded

Shares on Computer Running Microsoft Windows NT Server with IRPstackSize Parameter Set Too Low Accessed from a Windows NT Client
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To resolve this issue if the cause is the third condition in the "Cause" section
of this article, either correct the IRPstackSize parameter or apply the fix that
corrects this problem. For additional information about how to correct the
IRPstackSize parameter and a fix that corrects this problem, click the article
number below to view the article in the Microsoft Knowledge Base:

  Q198386 Changes in IRP Stack Size in Lanman Server

Additional query words:

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Keywords          : exc4 exc5 exc55 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : winnt:4.0,5.0,5.5
Issue type        : kbprb

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