| File Extension: | MSF |
| File Type Description: | Mail Summary File |
| File Type Developer: | Mozilla |
| Primary Associated Software: | Mozilla Thunderbird |
| Primary Software Developer: | Mozilla |
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Mozilla created the Mail Summary File (MSF) file for the Mozilla Thunderbird software series. Visitor data analysis shows that these Mail Summary File files are typically seen on Windows 10 user machines from China. Google Chrome is their primary internet browser for the bulk of these users.
 | Blue Card Manager by Scout Management Software |
 | Mozilla Thunderbird by Mozilla |
 | Miranda IM by Miranda IM project |
 | NetScape Mail by NetScape |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .ENV | Adobe Systems Incorporated | Data Files | Adobe Dictionary Data File |
| .19 | IBM | Data Files | IBM Voice Type Languages Scripts Data File |
| .SBD | Microsoft Corporation | Data Files | Office Accounting Company Data File |
| .MON | Mozilla | Backup Files | Firefox Monday Bookmark Backup File |
| .BCI | Belarc | Data Files | Belarc Advisor Report File |
| .MIM | Internet Engineering Task Force | Encoded Files | Multi-Purpose Internet Mail Message File |
| .MIME | Various Developers | Encoded Files | Multi-Purpose Internet Mail Extension |
| .LOCK | Mozilla | Uncommon Files | Lock File |
| .10 | IBM | Data Files | IBM Voice Type Languages Scripts Data File |
| .RSA | Various Developers | Uncommon Files | RSA Certificate File |
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