If you are looking for a tool that can convert Thunderbird to PST then using the eSoftTools Thunderbird to Outlook Convertertool. It can convert all the emails of Thunderbird to Outlook without delay or error. It is straightforward to use. Also, a preview is shown to the user before conversion. A free demo Pack is also given to all users in which users can convert the initial 25 items of MBOX to Office 365.