What is an OLK file? 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.