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Application Category & Support
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MIME & File Signature
How to open MSF File Extension
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MSF File Extension

The MSF files denoted by the extension .msf, is the Mail Summary File of Thunderbird emails. It only contains the headers and the summary of emails. Thunderbird stores the mails in two files- one that holds the actual mail (MBOX File) and the other that holds the index of that particular mail. This index file is referred as the MSF file. The main function of this file is to make sure that the other applications import mail from the MBOX file without any extension.

Application Supported

  • The MSF files are supported by Mozilla Thunderbird email client
  • It comes under the category of email related data files.
  • Mozilla Foundation
  • Hexadecimal: 2F 2F 20 3C 21 2D 2D 20 3C 6D 64 62 3A 6D 6F 72 6B

The MSF file can be found at the following locations:

Windows Vista/7/8/8.1

  • C:\Users\Username\AppData\Roaming\Thunderbird\Profiles\ xxxxx.default

Windows XP/Windows Server 2003

  • C:\Windows\Application Data\Mozilla Thunderbird\Profiles\xxxxx.default

In Windows 95/98/ME

  • C:Documents and Settings\user\Local Settings\Application Data\Microsoft\Outlook

MSF file can be easily viewed using Thunderbird application. This file store index details. Hence, it automatically configured by Thunderbird each time it is used.

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