This article was previously published under Q243266
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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
Uninstalling Microsoft Internet Explorer 5.01 or Outlook Express 5.01 may result in removing Outlook Express from the computer altogether.
If Outlook Express 4.x was not previously installed on the computer, there is no version of Outlook Express to revert to. Internet Explorer can revert from version 5.01 to version 5, but Outlook Express can revert from version 5.01 only to the last full version of Outlook Express that was installed. If Outlook Express 4.x was never installed, there is no full version to which Outlook Express can revert, causing Outlook Express to be removed entirely.
To work around this problem, reinstall Internet Explorer from the following Microsoft Web site: