MSF Converter

Convert Mail summary files (MSF) online for free


Drop or upload your .MSF file
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How to convert your MSF file

  1. Click the "Select File" button above, and choose your MSF file.
  2. You'll see a preview.
  3. Click the "Convert file to..." button to save your file in the format you want.

Convert MSF to another file type

The converter easily converts your MSF Summary files to various formats - free and online. No Mozilla Thunderbird or other Data software needed.

  • MSF to MP3
  • MSF to WTV
  • MSF to FITS
  • MSF to PSP
  • MSF to WEBM
  • MSF to CAF
  • MSF to H261
  • MSF to DRC
  • MSF to GSM
  • MSF to AU
  • MSF to LATM
  • MSF to F4V

Convert a file to MSF

To convert other file formats to the "Mail Index File" file type, you need software like Mozilla Thunderbird or a similar tool.


About MSF files

The .MSF file extension primarily represents a Mail Summary File used by Mozilla Thunderbird to index local email folders. Secondary uses include a proprietary audio format for legacy Sony and Olympus digital voice recorders, and setlist files for Zubersoft MobileSheets.

For email users, the major disadvantage of an .MSF file is that it contains no actual message bodies - only headers and a structural message index. Users frequently attempt to open or convert these files to recover lost emails, only to extract unreadable metadata. Actual emails reside in companion extension-less MBOX files. For audio users, the .MSF format is a restrictive, dead-end proprietary container that requires obsolete software and cannot be played by modern web browsers or mobile devices.

For voice recordings, convert .MSF to MP3 for standard web and mobile playback, or WAV for high-fidelity archiving. For Thunderbird indexes, direct conversion is futile; instead, use the parent MBOX file to convert actual emails to PDF or EML. Drag and drop your file to analyze and convert it - free, online, and without installing software.

Use Convert.Guru to open and convert your MSF file.

Users also converted INBOX, MSG, MD, MARKDOWN, MFS, ADX, MXF, EML, MCF, DOCX, PST, MP3 and TXT files.


FAQ

If you want to convert MSF file to SF, PST, MSI, M2, PDF, TMP, TEMP, CACHE, LOG, BAK or OLD, you can use Mozilla Thunderbird or similar software from the "Mail Index & Voice Recording" 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 MSF, try Mozilla Thunderbird or another comparable tool in the "Mail Index & Voice Recording" category.



The MSF 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 MSF converter.