All about OLK Files

The OLK file type is primarily associated with Microsoft Outlook for Mac.

OLK	File extension: OLK
	File type:	address book file

What is an OLK file?

OLK files mostly belong to Microsoft Outlook for Mac by Microsoft. OLK (Outlook) is a proprietary file type used by Outlook as a database to store message information. It was developed by Microsoft for Outlook and can be used on Mac and Windows. On Mac, for example, OLK14 MESSAGE files are used when the client reads message, and OLK14 MSGSOURCE file type is used to store the message contents, excluding any attachments, which are stored in yet another OLK file extension.
Multiple OLK file extensions are used to store individual components of a message. These files form the database backend maintained by Mac for Outlook.
OLK files are proprietary to Microsoft and can only be generated or opened safely by its products. Word and Outlook can open OLK files and edit them, though there are file viewers that can show the contents of OLK files such as OLK Viewer, OLK Viewer Tool by FreeViewer, OLK File Viewer by SoftwarePro, File Magic and many others, available for Windows and Mac. A text editor, such as Notepad can also view the contents of OLX files.
Other file associations include these file formats also used by Outlook together with OLK: QRY, RE2, USR, REA, TXN, SBL

How do you open OLK files?

You need a suitable software like Microsoft Outlook for Mac to open an OLK file. You need a suitable software like Microsoft Outlook for Mac from Microsoft to open an OLK file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your OLK file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a OLK file directly in the browser:. Just drag the file onto this browser window and drop it.

Online OLK Text Viewer

Choose your .olk file to analyze

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Online File Viewer

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4 Steps to Open an Unknown .OLK File

Because .OLK files can come from different programs, they aren't universally openable.

Identify the Source: If received from a macOS user or an email export, it often suggests a Microsoft Outlook for Mac address book data file.
Check the Header: Inspect the first bytes in a text editor or hex viewer:
- Readable XML/JSON implies structured data.
- "PK" indicates a zipped archive.
- Scrambled text suggests a proprietary binary format.
Use the Original Software: Opening usually requires the original program; try Microsoft Outlook for Mac, Microsoft 365, or ask the sender if uncertain.
Use this Webpage: Drag and drop the file into our viewer to detect the format, extract readable text or metadata, and preview when possible.

Technical Data for OLK File Extension

File classification:

Data

an olk address book file is a special file format by Microsoft and should only be edited and saved with the appropriate software.

How to solve problems with OLK files

Associate the OLK file extension with the correct application.
Update your software that should actually open address book files. Because only the current version supports the latest OLK file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available Microsoft Outlook for Mac update.
To make sure that your OLK file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .OLK file online - secure, fast, and no downloads needed.