Table of Content
Introduction
File Extension
Application Category & Support
Owned by Organization
MIME Type
Supported Operating Systems
File Location
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Outlook Address Book File (.OLK)

The OLK file extension is an acronym for Outlook Address Book File which was established by Microsoft Corporation. The .olk files are used by Outlook email application to store contact information for people and organization such as phone numbers, names, addresses, company data and other contact information. The Outlook address book is a virtual file that is available in Outlook temporary folder (OutlookSecureTempFolder).

The file extension for Outlook Address Book is *.olk.

The OLK file extension can be classified under Database files.

Microsoft Outlook (Windows)

Microsoft Corporation

  • application/octet-stream
  • Windows Server 2003/2008/2012
  • Windows 8
  • Windows 7
  • FreeBSD
  • NetBSD
  • Linux
  • OpenBSD
  • Mac OS X
  • Android
  • iOS
  • Outlook 97 – HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Outlook\Security
  • Outlook 98 – HKEY_CURRENT_USER\Software\Microsoft\Office\8.5\Outlook\Security
  • Outlook 2000 – HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security
  • Outlook 2002/XP – HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security
  • Outlook 2003 – HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security
  • Outlook 2007 – HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security
  • Outlook 2010 – HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security
  • Outlook 2013 – HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security
  • Outlook 2016 – HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Security
  • Corrupted or inaccessible file.
  • The required software to view the file is not installed or even corrupted.
  • The version of compatible application is not correct.
  • Invalid registry key entries.
  • There is some bugs created issues with opening OLK file.