It is because no other desktop email program supports PST file format other than MS Outlook. But primarily, if a user wants to open emails in Mozilla Thunderbird, Eudora, Apple Mail, or any other MBOX-supported email client, the user has to convert PST to MBOX format.

Many email clients such as Thunderbird, Apple Mail, Opera Mail, Entourage, and Eudora use this file to store user data such as emails, tasks, contacts, and journals. With the help of this file, MS Outlook stores all the data on the local machine. MS Outlook uses this file to store user mailbox data such as emails, contacts, tasks, calendars, and journals. PST or Personal Storage Table is a popular file format. If you are searching for a simple way to convert PST to MBOX, this post will help you.

Also, learn how to convert PST to MBOX manually. In this post, we will discuss PST and MBOX files and why users convert PST to MBOX.