Click the "Select File" button above, and choose your MSO file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert MSO to another file type
To convert MSO data files to another format, you need Microsoft Outlook or other Data software.
Convert a file to MSO
To convert other file formats to the "OLE Embedded Object File" file type, you need software like Microsoft Outlook or a similar tool.
About MSO files
The .mso file format is primarily a proprietary Microsoft Office OLE (Object Linking and Embedding) data file. It is most commonly encountered as an email attachment named Oledata.mso. This happens when a user sends an HTML-formatted email using Microsoft Outlook or Microsoft Word that contains an embedded object, such as a spreadsheet chart, a custom graphic, or a MathType equation. These files store the precise rendering information required to display the embedded element correctly within the Microsoft ecosystem.
The major disadvantage of the .mso format is its strictly proprietary nature. If you open an email containing an Oledata.mso file in a non-Microsoft email client like Apple Mail, Mozilla Thunderbird, or Gmail, the embedded object will fail to display. Instead, you are left with an unopenable, useless attachment. They are inherently tied to the specific Microsoft Office framework that generated them, creating a highly frustrating experience for users on Mac, Linux, or mobile devices.
To extract and view the underlying data, you must convert the file. For archiving and universal sharing, convert the extracted object to PDF. For web use or simply viewing hidden charts and equations, extract the objects to JPG or PNG. Drop your file here to view and convert it securely right in your browser.
Convert.Guru analyzes your MSO file, detects the exact format, and lets you read the text inside.
If you want to convert MSO file to PDF, TMP, TEMP, CACHE, LOG, BAK, OLD, NEW, PART, DOWNLOAD, CRDOWNLOAD or LOCK, you can use Microsoft Outlook or similar software from the "Embedded Object Data Storage" category. In the File menu, look for Save As… or Export….
To convert DEVICE, CACHE, SOCK, SYMLINK, PID, MOUNT, FIFO, LOG, PIPE, TMP, JUNCTION or TEMP files to MSO, try Microsoft Outlook or another comparable tool in the "Embedded Object Data Storage" category.
The MSO 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 MSO converter.