Outlook creates a PST file, and it contains a large amount of data in a single file like store copies of messages, calendar events, and other items. On the other hand, an MBOX file contains email messages in a single text file. If someone wants to move their files from Outlook PST to Thunderbird MBOX file format. You can easily convert PST files to MBOX file format. So, we will explain the best PST to MBOX converter free download for windows. Before moving on to the tools, let us discuss the reasons to convert PST to MBOX Thunderbird. SameTools PST to MBOX Converter Tool is the best tool to migrate PST to MBOX format. It is the most secure and reliable software available with many advanced features. It allows converting PST files into MBOX and other various file formats. Also, it has a simple user interface that helps to use for non-technical users. Let us discuss some detailed features of this software. PST file Converter is another best tool to convert PST to MBOX format. This app is also available with advanced options that users can choose as their requirements. It allows users to convert multiple files at a time. Let us discuss more features of Outlook to Thunderbird Converter Online. PST to MBOX Converter tool is an advanced utility, and it is available with a simple interface. Everyone can use this application. Also, it provides the option to migrate batch files in a single process. Moreover, you can convert mailbox items like contacts, Address books, Emails, etc, to MBOX file format. PST to MBOX converter is the best tool for converting the PST file into Thunderbird MBOX format. All software has extraordinary features. But tool provides the best security and features to the users. It is the most secure and reliable utility to migrate Outlook PST files to Thunderbird format.