OLEXP: Outlook Express Does Not Start from the Mail Button in Internet Explorer

Article translations Article translations
Article ID: 277015 - View products that this article applies to.
This article was previously published under Q277015
For information about the differences between Microsoft Outlook Express and Microsoft Outlook e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:
257824 OL2000: Differences Between Outlook and Outlook Express
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
Expand all | Collapse all


Outlook Express does not start when you click the Mail button, and then click Read Mail in Microsoft Internet Explorer. Outlook Express is verified as installed and starts from the Run dialog box. Additionally, it may not be listed as an available e-mail program in Internet Explorer's Internet Options.


This behavior can occur because of missing or invalid registry key entries.


WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

Make sure that the following registry keys are in place and have the correct values. You may need to add them or parts of them. To start Registry Editor, click Start, and then click Run. In the Open box, type regedit, and then click OK.
HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Envelope

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Envelope\CLSID
Default Value="{A08AF898-C2A3-11d1-BE23-00C04FA31009}"

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Envelope\CurVer
Default Value="OutlookExpress.Envelope.1"

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Protocols

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Protocols\mailto
Default Value="URL:MailTo Protocol"
"URL Protocol"=""

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Protocols\mailto\DefaultIcon

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Protocols\mailto\shell

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Protocols\mailto\shell\open

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\Protocols\mailto\shell\open\command

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\shell

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\shell\open

HKEY_LOCAL_MACHINE\Software\Clients\Mail\Outlook Express\shell\open\command


Article ID: 277015 - Last Review: January 29, 2007 - Revision: 2.2
  • Microsoft Outlook Express 5.5
  • Microsoft Outlook Express 5.01 Service Pack 2
  • Microsoft Outlook Express 5.0
  • Microsoft Outlook Express 5.5
  • Microsoft Outlook Express 5.01 Service Pack 1
  • Microsoft Outlook Express 5.0
  • Microsoft Windows 98 Standard Edition
  • Microsoft Windows 98 Second Edition
kbprb KB277015

Give Feedback


Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from smallbusiness.support.microsoft.com