Article ID: 244459 - View products that this article applies to.
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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:
(http://support.microsoft.com/kb/257824/EN-US/ )OL2000: Differences Between Outlook and Outlook Express
After you uninstall Outlook Express 5 and revert to Outlook Express 4.x, entries may appear to be missing from the address book. When you add new contacts to the address book, they do not seem to be added.
This behavior occurs because uninstalling Outlook Express 5 does not uninstall the Outlook Express 5 version of the Windows Address Book component. Outlook Express 4.x does not display address book items per identity, as does Outlook Express 5. Instead, Outlook Express 4 displays entries that are listed on shared contacts by default.
To resolve this issue, uninstall the Windows Address Book component manually:
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