eSoftTools Thunderbird to Outlook Converter is the most recommended and exact tool. Users may effortlessly export Thunderbird to Outlook after installing and running the software on Windows OS. In the converted PST file, the tool always keeps mail data attributes and attachments. It supports a variety of handy conversion formats and allows you to save all of your mailbox emails in a single or separate PST file. You may first test the trial version for free, which converts 25 emails from each inbox.