file extension MSF - Mozilla Thunderbird mail summary file
File extension MSF description:
Thunderbird's mail files are in the standard plain text "mbox" format, which almost all mail programs can use or import. Many proprietary mail programs have a function to import from Eudora, which also uses the "mbox" format; this function should read your Mozilla mail files properly.
Your mail files are inside your profile (see the Profile Folder), in the Mail and (if you use IMAP) ImapMail folders. Each mail folder (Inbox, Sent, etc.) is stored as two files — one with no extension (e.g. INBOX), which is the mail file itself (in "mbox" format), and one with an .msf extension (e.g. INBOX.msf), which is the index (Mail Summary File) to the mail file. Tell the other program to import mail from the file with no extension.
Associated applications to file extension MSF:
Company / developer:
Mozilla Foundation
Get the acclaimed email client from Mozilla. Import your existing mail and enjoy powerful spam protection. Mozilla’s Thunderbird email application is more powerful than ever. It’s now even easier to organize, secure and customize your mail.
Thunderbird features many new enhancements to help you better manage your unruly inbox, and stay informed. Thunderbird 2 scales to the most sophisticated organizational needs while making it easy to find what you need.
Secure and Protect Your Mail
Mozilla has bolstered Thunderbird’s acclaimed security and privacy measures to ensure that your communications and identity remain safe. It’s like having your own security guard online.
Get Your Mail, Your Way
Thunderbird allows you to customize your email to suit your specific needs whether it’s how you search and find messages or listening to music right out of your inbox.


