Rating: 4.9 - based on 1255 customer reviews A complete help of how to convert Thunderbird Mailbox to Outlook PST, Office365, EML, MSG, Lotus Notes NSF, EMLX, HTML, Gmail Account, and Yahoo account directly.
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Win 10 & all below version
Step-1) Open the software

Step-2) click on "Add File/Folder" button from the toolbar or from File menu and the below screen appears.

There are 3-type of file selection options and these are describe below-
Selection Mode- 1) Select MBOX File- If you want to export only one MBOX file, then this option is for you to choose and convert MBOX to PST, or other formats. Now click on the Next button.
Selection Mode- 2) Select MBOX Folder- If you want to perform batch MBOX or Thunderbird MBOX migration, then select it and choose the location of folder having MBOX files. Now click on the Next button.
Selection Mode- 3) Auto Load Thunderbird Profile- This option helps if you want to export all list of configured mailboxes in Thunderbird email client. The tool auto detect the location of Thunderbird mailbox path and list you all configured mailboxes in tree like strucuter where you can choose the mailboxes and convert into required format.
Step-3)-
Here we demostrate you with Selection Mode-3 - Auto Load Thunderbird Profile
Choose the option-3 (Auto Load Thunderbird Profile) and click on the Next button.

All of configured thunderbird mailboxes appears on the left panel of the software. Here you an individually expand the mailboxes and check the preview of items.
The software for Thunderbird Converter has pre-inbuilt 10+ types of conversion options. See the working steps by clicking on the below tabs-

Now click on "Convert MBOX" button from the toolbar or from the File menu or from the "Convert & Import" menu.

Here you can see, the tool offers you multiple conversion option like -
Choose your required conversion option as shown on above image
Email Filter - Apply email filter if you want to save messages in between certain dates.
Now select the saving location by clicking on the BROWSE button
After selecting the destination path, Click on CONVERT button.

Once conversion completed, the tool show you confirmation message as below screenshot.
Thunderbird to Outlook Conversion Completed

Now click on the toolbar "Import into Cloud >> Import to Office365
The following below screen appears-
Fill your Office365 credential in respective fields (See on the above screenshot)
After entering the Office365 login credentials, click on "Convert" button. In a few minutes, the software shows you confirmation message about import process completed successfully.
Thunderbird Mailbox to Office365 Migration Completed

Now click on the toolbar "Import into Cloud >> Import to Gmail
The following below screen appears-
Provide your Gmail account credential (E-mail address & Password) in respective fields (See on the above screenshot)
After entering the Gmail account login credentials, click on "Convert" button. In a few minutes, the software prompts a confirmation message as below-
Thunderbird to Gmail Migration Completed

Now click on the toolbar "Import into Cloud >> Import to Yahoo
The following below screen appears-
Provide your Gmail account credential (E-mail address & Password) in respective fields (See on the above screenshot)
After entering the Yahoo account login credentials, click on "Convert" button. In a few minutes, the software prompts a confirmation message as below-
Thunderbird to Yahoo Migration Completed