Whenever you need to PST to Thunderbird converter free download you can do so by using the eSoftTools PST to MBOX Converter Software. Its techniques are simple and easy. During the PST to MBOX conversion, email properties are maintained. To convert required emails from a PST file, the user simply needs to select the mail filtering option and choose the from and to dates, etc. Besides new customers, All users have access to the demo version. You can convert 25 email items per folder for free in the demo version.