Registrations are now open. Join us today!
There is still a lot of work to do on the wiki yet! More information about editing can be found here.
Already have an account?

Microsoft KB Archive/278243

From BetaArchive Wiki
Knowledge Base

"Unable to open your default mail folders" when you start Outlook 2000

Article ID: 278243

Article Last Modified on 1/29/2007


  • Microsoft Outlook 2000 Standard Edition
  • Microsoft Windows 98 Standard Edition

This article was previously published under Q278243


When you start Outlook, you may receive one of the following error messages:

Unable to open your default mail folders. The information store could not be opened.


Network problems are preventing connection to the Microsoft Exchange Server computer. Contact your system administrator if this condition persists.


This behavior can occur because the Secur32.dll file is missing or damaged.


To resolve this behavior, replace the Secur32.dll file by using the Microsoft Windows System File Checker (SFC) in Windows 98. To do this:

  1. Click Start, point to Programs, point to Accessories, point to Systems Tools, and then click System Information.
  2. Click Extract One File From Installation Disk, type Secur32.dll in the Specify the file you would like to restore box, and then click Start.
  3. Verify that the proper location for the installation source media is specified in the Restore From box, and that the location in the Save File in box specifies the C:\WINDOWS\SYSTEM folder.
  4. Click OK twice.

When the process is finished, click OK, restart Outlook, and then test the functionality of your e-mail account by sending and receiving messages.


This behavior can also occur because the Secur32.dll file did not install correctly during the installation or re-installation of the Transmission Control Protocol/Internet Protocol (TCP/IP) networking protocol.

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

170637 XCLN: Error Message: Unable to Open Your Default Mail Folder

The non-working Secur32.dll file is version This non-working version is installed by the following products:

   Product Name                             File Size Date       File name    Platform
   Microsoft Small Business Server 2000     59,904    29-9-1999  Dsclient.exe \cd1\clients\win9x
   Microsoft Windows 2000 Datacenter Server 59,904    29-12-1999 Dsclient.exe \clients\win9x
   Microsoft Windows 2000 Server            59,904    29-9-1999  Dsclient.exe \clients\win9x

The working Secur32.dll file is version This working version is installed by Microsoft Windows 98 media -

Additional query words: OL2K hang connect start

Keywords: kbstartprogram kberrmsg kbprb KB278243