Click the "Select File" button above, and choose your OLK file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert OLK to another file type
To convert OLK messages to another format, you need Microsoft Outlook or other Data software.
Convert a file to OLK
To convert other file formats to the "Email Cache File" file type, you need software like Microsoft Outlook or a similar tool.
About OLK files
The .OLK file is a proprietary data container used primarily by Microsoft Outlook for Mac to store downloaded email messages, contacts, and offline folder data. Unlike standard email formats, these files are generated as fragmented cache items inside the macOS library folder rather than a single portable archive. This format is notorious for its strict vendor lock-in. .OLK files are deeply tied to the specific user profile and Outlook database identity that created them. You cannot easily share them or open them on Windows. Standard text editors display gibberish, and generic online converters fail because the format is closed, undocumented, and often requires external database index files to reconstruct the original message. If you need to share or migrate these emails, you must convert them. The best target formats are EML for individual messages, PST for Windows Outlook compatibility, or PDF for permanent archiving. Extracting the data directly from the .OLK file often results in lost metadata, attachments, or broken formatting because the file is incomplete on its own. Because the format is a closed, proprietary chunk of a larger database, it is difficult to convert directly. Often, only the original Microsoft Outlook software can properly read or export the data. If our analysis detects standard HTML or plain-text email content embedded inside, viewing or basic conversion may still be possible.
Convert.Guru analyzes your OLK file, detects the exact format, and lets you read the text inside.
Users also converted OLK15MESSAGE, OLK15RECENTADDRESSES, OLK14MESSAGE, OLK15MSGATTACHMENT, OLK15SIGNATURE, OLK14CONTACT, OLK15CONTACT, EML, ZIP, PDF, OAB, PST and SRS files.
FAQ
If you want to convert OLK file to PST, CSV, JSON, XML, YAML, YML, TOML, INI, CFG, CONF, DAT or DB, you can use Microsoft Outlook or similar software from the "Email Message Cache Data" category. In the File menu, look for Save As… or Export….
To convert DBF, XML, SQLITE, XLSX, SQL, TSV, ACCDB, YAML, MDB, CSV, ODS or JSON files to OLK, try Microsoft Outlook or another comparable tool in the "Email Message Cache Data" category.
The OLK Converter Story
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our OLK converter.