OL98: (CW) ErrMsg In MPR.DLL Starting Outlook with Windows NT (180127)


The information in this article applies to:

  • Microsoft Outlook 98
This article was previously published under Q180127
IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

NOTE: These procedures only apply if you have installed Outlook with the Corporate Workgroup/Other option. This option allows you to use Messaging Application Programming Interface (MAPI) services. To determine your installation type, on the Help Menu click About Microsoft Outlook. In About Microsoft Outlook you should see "Corporate" if you have the Corporate Workgroup installation.

SYMPTOMS

When starting Microsoft Outlook 98 with Microsoft Windows NT 4.0, you may receive the following error message:
The procedure entry point wnetnumcachedpassword could not be located in the dynamic link library 'MPR.DLL'

CAUSE

The wrong version of the Windows Messaging subsystem of Windows NT is installed on your computer.

RESOLUTION

Use one of these methods to resolve this problem:

Method 1

  1. Rename Mapi32.dll in the \Winnt\System32 directory on your computer.
  2. Click the Start button the Windows taskbar, point to Settings, and then click Control Panel.
  3. In Control Panel, double-click the Add/Remove Programs icon.
  4. Double-click Outlook 98.
  5. In the Outlook 98 Maintenance Wizard, click Rerun Outlook 98 Setup.

Method 2

Copy Mapi32.dll from your Microsoft Outlook 98 CD to the \Winnt\System32 directory on your computer. The Mapi32.dll file for Windows NT is located in the \EN\NT4SP3\I386 directory.

Method 3

As a last resort, remove and reinstall the Windows Messaging subsystem as described in the More Information section of this article.

MORE INFORMATION

CAUTION: The procedures below remove your existing mail profile information. You will have to create a new profile after following the steps below.

Follow these steps to remove and reinstall the correct Windows NT Messaging files:

Uninstall Outlook

  1. On the Windows Taskbar, click Start and point to Settings and then click Control Panel.
  2. Double-click Add/Remove Programs. On the Install/Uninstall tab, click Microsoft Outlook 98.
  3. In the Setup program, click Remove All. If prompted to remove the Windows Messaging component, click Keep.

Remove Windows Messaging

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows NT 4.0. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the Changing Keys And Values online Help topic in Registry Editor (Regedit.exe). Note that you should make a backup copy of the registry files (System.dat and User.dat) before you edit the registry.

  1. On the Windows Taskbar, click Start, point to Settings and then click Control Panel.
  2. Double-click Add/Remove Programs. On the Windows NT Setup tab, click to clear Windows Messaging, and click OK.
  3. Once the Windows Messaging component is removed, on the Windows Taskbar, click Start and then Run.
  4. In the Open box, type regedit and click OK.
  5. In the Registry Editor, navigate to the following key: 
    HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\Windows Messaging Subsystem
  6. Click the key Windows Messaging Subsystem and on the Registry menu, click Export Registry File. Export the key to your Desktop as a backup and with the key still selected, press the DELETE key to remove it from the registry.

Install Windows Messaging

  1. On the Windows Taskbar, click Start point to Settings and then click Control Panel.
  2. Double-click Add/Remove Programs. On the Windows NT Setup tab, click to select Windows Messaging. Click Details and make sure all required components are checked. Click OK and click OK.

Install Outlook

  1. Insert your Outlook CD into the drive.
  2. If Setup does not automatically start, click Start and then Run. In the Open box, type D:\Setup, where D is the name of your CD drive. Click OK.
  3. Follow the prompts to install.
Once Outlook is reinstalled, you must create a new profile. For more information on how to set up a profile, please see the following article in the Microsoft Knowledge Base:

182159 OL98: (CW) User Profiles and Information Services

REFERENCES

For more information on Windows NT errors with MPR.DLL, please see the following article in the Microsoft Knowledge Base:

163211 XCLN: Setup:WNetEnumCachedPasswords could not be located

Modification Type:MajorLast Reviewed:6/11/2002
Keywords:kberrmsg kbprb KB180127
©2002 Microsoft Corporation. All rights reserved.