This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

onedrive changed format, how do I change back to .eml

  • 1 reply
  • 1 has this problem
  • 5 views
  • Last reply by Matt

more options

software Onedrive changed my saved Thunderbird files to a different format which is .msf. I want my files back in the original format. I contacted Onedrive and they have no solution for this problem and suggested I contact you. I am desperate to save my email files. please tell me how to change my email files back to the original format.

software Onedrive changed my saved Thunderbird files to a different format which is .msf. I want my files back in the original format. I contacted Onedrive and they have no solution for this problem and suggested I contact you. I am desperate to save my email files. please tell me how to change my email files back to the original format.

All Replies (1)

more options

MSf files are indexes used by Thunderbird to list the email in the user interface. EML files are files created when you use the File > Save as option or drag an email onto say your desktop. Thunderbird release version does not save email in the program as EML files.

So perhaps you need to back up some and start with what went wrong and what you have done to try and fix things.