Article ID: 220837 - View products that this article applies to.
This article was previously published under Q220837
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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
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:
(https://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
This article describes how to turn off detection of duplicate contacts to allow faster and unattended moving or copying of addresses into the Contacts folder.
Duplicate detection is a new feature of Outlook 2000. This feature addresses the problem of having duplicate entries in a Contact folder. At the time of adding a contact, Outlook checks to see if it is a potential duplicate. If so, you are prompted for a resolution. There are three possible actions that can be taken when prompted. You can update the original contact, add the contact as a duplicate, or do not add the contact.
Duplicate Detection Turned OnDuplicate detection is turned on in the following situations:
Duplicate Detection Turned OffDuplicate detection is turned off in the following situations:
Manually Turning Off Duplicate DetectionTurning off duplicate detection can improve performance if you have a large number of contacts to import. This will speed up unattended moving or copying of addresses into the Contacts folder. You may want to turn the feature back on after the import is done.
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.
The duplicate detection feature can be turned off manually by editing a key in the registry. To edit the registry to turn off duplicate detection, follow these steps:
For more information about Duplicate Handling, click Microsoft Outlook Help on the Help menu, type Duplicate Detection in the Office Assistant or the Answer Wizard, and then click Search to view the topics returned.