Article ID: 212991 - View products that this article applies to.
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NOTE: These procedures only apply if you have installed Outlook with the Internet Mail Only option. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Internet Mail Only option installed, you see "Internet Mail Only".
For information about the differences between Microsoft Outlook and Microsoft Outlook Express e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/257824/EN-US/ )OL2000: Differences Between Outlook and Outlook Express
After you complete an installation of Microsoft Outlook on Microsoft Windows 95, Windows 98 and Windows NT 4.0, you may receive the following error message when you start Outlook:
When you click OK you receive a second error message:
Outlook requires Microsoft Outlook Express 4.01 or greater. You can install Outlook Express 5.0 by running IESetup.exe from the Internet Explorer folder where you installed Outlook, or download it from the Internet Explorer site on the Microsoft Web.
When you click OK to the second error message, Outlook closes. When you restart Outlook, you receive the same two error messages.
An OLE registration error occurred. The program is not correctly installed. Run Setup again for the program.
Outlook 2000 requires certain files shared with Outlook Express in order to function properly.
This situation can be caused by installing Microsoft Internet Explorer 4.x or 5.x with a Browser Only or Custom installation that does not install Outlook Express. If Microsoft Outlook 2000 is then installed, and you choose not to update the browser, the Outlook Express support files required by Outlook are not installed.
Follow the instructions on the first error message and install Outlook Express.
How to Reinstall Outlook Express on Microsoft Windows 95
How to Reinstall Outlook Express 5 Using Windows 95, the Original Release of Microsoft Windows 98 or Windows NT 4.0
How to Reinstall Outlook Express 5 Using Microsoft Windows 98 Second Edition
This behavior is by design. The Internet Mail Only installation requires the installation of Microsoft Outlook Express. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/230076/EN-US/ )OL2000: Why Outlook 2000 Requires Outlook Express