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.OLK File Extension

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File TypeOutlook Address Book File

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CategoryData Files


This file is saved in a binary format, which requires a specific program to read its contents.


Address book created by Microsoft Outlook, an email application; may contain contact information for people and organizations; can store names, phone numbers, addresses, titles, organization data, and other contact information; used for saving and loading contacts.

More Information

OLK files can be opened manually in Outlook 2003 by typing the following command: Outlook.exe /l olk_filename. OLK files can also be opened by Microsoft Word 2003 and used for mail merge and other document operations.

Outlook contacts are more often stored as Personal Address Book (.PAB) files.

Programs that open OLK files
Microsoft Outlook 2016
Microsoft Word 2016
Updated 5/24/2010