MBOX to PST Convertertool by eSoftTools. This is a popular technique for converting MBOX to Outlook PST files. Thunderbird, Pocomail, AppleMail, Entourage, Spicebird, Eudora, SeaMonkey, Opera Mail, and other popular email clients are all supported by this software. A free trial version of the software is also available. This software is compatible with all versions of Windows and Outlook.