But, prior to proceeding with this import step, users must install the "Import Export Tools" add-on. Make sure that you are using the MBOX Backup system is in place to safeguard data loss in the event that the process of import is interrupted.
Step 1: Open Thunderbird using going to Programs and clicking Mozilla Thunderbird
Step 2: Click on the Tools option, then select the Import Export Tools option. Then click Import MBOX file option.
Step 3: In the pop-up window, select option Directly import one or more Microsoft Office files option, then when you're done, click 'OK'
Step 4: Browse for the MBOX file in the particular place where they are kept and click the Open button to initiate the process of importing.
Step 5: Follow the import process, you will be able to view all the items in your mailbox as follows:
If you've imported your email file to MBOX file format and would like to transfer it into Thunderbird by using techniques that are manual it is easy to access these files using the email client. Importing the MBOX file to Thunderbird can be easy and easy, however it doesn't guarantee all the information contained within the mailbox will be in good condition and will suffer no loss. Thus, this process should be completed automatically with professional software.
MBOX to PST Converter Software
Windows Live Mail to PST Converter