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When you open the Address Book in Microsoft Outlook, and then click Contacts, some recipient addresses are listed two times. One listing has an e-mail appended to the address, and the second listing has a fax appended to the address.
This behavior is by design in the Outlook Address Book. Recipients who have both an e-mail address and a fax number are listed two times; one time for the e-mail address and one time for the fax number.
If you are not using Outlook to send faxes, you can avoid this behavior by storing fax numbers in a field that is not specific to faxing. For example, you can store fax numbers in the Other field in the telephone numbers section of the name-Contact dialog box. This way, the fax number is still available, but it is not considered an alternative method for delivery by Outlook or by the Check Names feature.
If you have already stored fax telephone numbers in a fax telephone number field, you can work around this behavior by globally moving the fax numbers from the current field to another field that is not related to faxing.
Back up the Contacts folder or make a copy of the exported file before you make any changes, or import them back to Outlook, to avoid accidentally losing any contacts in the process.
Use the following methods to globally move fax numbers from one field to another:
How to Export the Current Contacts Folder
How to Edit the Exported Data File
How to Import the Changed Data Back to Outlook
Duplicate entries double the size of the list that you need to search in order to address a message. In addition, if you use the Check Names feature when you address an e-mail message, you are forced to choose between the fax number and the e-mail address listings, even though you are sending an e-mail message.