Click the "Select File" button above, and choose your OLK15MESSAGE file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert OLK15MESSAGE to another file type
To convert OLK15MESSAGE emails to another format, you need Microsoft Outlook for Mac or other Data software.
Convert a file to OLK15MESSAGE
To convert other file formats to the "Email Message File" file type, you need software like Microsoft Outlook for Mac or a similar tool.
About OLK15MESSAGE files
The .olk15message file is a proprietary email message container generated exclusively by Microsoft Outlook for Mac. It stores individual email data, including headers, body text, and sometimes inline elements. These files are typically hidden deep within the macOS Library directory as part of the local Outlook profile database. Users often need to convert .olk15message files because they are completely locked into the macOS Microsoft ecosystem. If you copy this file to a Windows PC or send it to someone using Apple Mail or Mozilla Thunderbird, they cannot open it. The format lacks cross-platform compatibility, cannot be read by web browsers, and requires an active, paid Microsoft 365 subscription to access natively. The best conversion targets are standard email formats like EML for broad compatibility across almost all modern email clients, or PDF for permanent, non-editable document archiving. Converting to EML preserves the underlying metadata, while PDF flattens the content but guarantees anyone can read it on any device. Standard online converters frequently fail with .olk15message because it is a closed, undocumented, and proprietary format. The internal structure is heavily fragmented and tied to the local Mac SQLite database index to resolve sender details and attachments. Often, only the original Microsoft Outlook software can properly read or export the data. If our analysis detects a supported underlying or embedded format, viewing or conversion may still be possible.
Convert.Guru analyzes your OLK15MESSAGE file, detects the exact format, and lets you read the text inside.
Users also converted OLK, OLK15EVENT, OLK15SIGNATURE, EML, ZIP, JPG, TSX, EM_, OLK14MESSAGE and OLM files.
FAQ
If you want to convert OLK15MESSAGE file to CSV, JSON, XML, YAML, YML, TOML, INI, CFG, CONF, DAT, DB or SQL, you can use Microsoft Outlook for Mac or similar software from the "Email Message Storage" 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 OLK15MESSAGE, try Microsoft Outlook for Mac or another comparable tool in the "Email Message Storage" category.
The OLK15MESSAGE 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 OLK15MESSAGE converter.