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Microsoft KB Archive/170637

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Knowledge Base

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

Article ID: 170637

Article Last Modified on 8/17/2005


  • Microsoft Exchange Client 4.0
  • Microsoft Exchange Client 5.0
  • Microsoft Exchange Client 5.5
  • Microsoft Exchange Client 5.0
  • Microsoft Outlook 97 Service Pack 1
  • Microsoft Outlook 97 Service Pack 1
  • Microsoft Outlook 97 Standard Edition
  • Microsoft Outlook 97 Service Pack 1
  • Microsoft Outlook 98 Standard Edition

This article was previously published under Q170637


When starting the Microsoft Exchange Client or Microsoft Outlook, the following message may be displayed:

Unable to open your default mail folders. You do not have permission to log on.


Outlook will also display the following message:

Would you like to open your default File System folder instead?

[Yes] [No]

Clicking OK in the Exchange Client or OK and No in Outlook will return you to the desktop. Clicking OK and Yes in Outlook will open empty system mail folders.


The logon credentials of the Exchange Client or Outlook are different from the logon credentials of the user logged into the workstation.


Log off of the workstation and log back on with the same user credentials as the Exchange Client or Outlook.


  1. Remove Named Pipes from the Exchange binding order. See the following Knowledge Base article for more information on this topic.

    163576 XGEN: Changing the RPC Binding Order

  2. After removing Named Pipes from the Exchange binding order, from Control Panel, double-click Mail. On the Services tab, click Show Profiles, then click Properties for the profile, then Properties for Exchange Server service. On the Advanced tab, clear the Use Network Security during Logon option. This will prevent the Exchange Client from using the cached credentials used to log into the workstation initially.

NOTE: If Named Pipes is listed in the Exchange Client binding order as the primary protocol, the logon credentials will be used regardless of the Use Network Security setting. This is documented in the following Knowledge Base article:

146188 XCLN: Use Network Security Option Not Working as Expected

Additional query words: 8.5

Keywords: kbprb KB170637