To find the answer to this question, you need to read this article completely. Moving Outlook data to Thunderbird or another email application is not a big deal; you can do it by yourself easily, but you have to know the right procedures and solutions. So, as we all know, Microsoft Outlook provides multiple features to all of us, whether we are using its services for free. We also have free access to their application and its servers, but sometimes certain conditions force us to move to different email clients like Thunderbird, Apple Mails and others, due to which we need our old data in the new email clients. At that moment, I tried multiple techniques to move my Outlook data to Thunderbird, but I failed, and I found that the Outlook data cannot be directly transferred to any other email clients. Microsoft Outlook uses PST and OST file formats, where the OST stands for (Online storage table), and PST stands for (personal storage table). So, the OST files are continuously synced with the web server, so the OST file is not convertible, while the PST file is convertible and portable. The PST files are easily accessible on any computer, which is why PST files are convertible into any other file formats. So after some research, I found that the PST file is not directly convertible to the MBOX file format. MBOX is a file format Thunderbird and Apple Mail. At that moment, my friend informed me about the BitRecover PST to MBOX Converter program. I used this and moved all my Outlook data to Thunderbird. So now it’s on you if you are searching for the same, so before performing any techniques, check out this article.