It is safe and the users can access their Thunderbird files in PST format without any hassle so try professional software Thunderbird to PST Converter. It is the safe and secure tool which can effectively convert MBOX file to PST and another file format such as EML, EMLX, HTML, PDF, MSG and etc. This software has a selective feature that can be used to import items and folders from Thunderbird to PST file.
Steps to export Thunderbird to PST for Free:
Run Mozilla Thunderbird and open the desired mailbox.
Select the emails that you wish to export in the PST file.
Right-click and select the "Save As" option.
Choose the desired folder to store the Thunderbird emails and click on the “Select Folder” option.
If you're planning to export Thunderbird emails to Outlook, you can use MBOX to PST Converter tool. It has the capability to perform hassle-free migration tasks with ease. Using this tool, you can convert single or multiple Thunderbird Files to PST.
Thunderbird to Outlook exporter is a reliable solution that simply moves Thunderbird to Outlook file format that is easily extracted email clients application like Entourage, Google takeout, Netscape, SeaMonkey, and etc. User can transfer single and multiple files though with batch conversion. selective conversion feature export items and folders from Thunderbird to Outlook.
More Info;- http://www.thunderbird.tooutlookconverter.com/