If you are searching for the most reliable tool to convert MBOX to PST for large mailboxes without data loss, then the Aryson MBOX Migrator Tool is a highly recommended solution. Many users store years of important emails in MBOX-based email clients such as Thunderbird, Apple Mail, SeaMonkey, Eudora, Entourage, Opera Mail, and Google Takeout. It also converts MBOX to PST and various other file formats. https://www.arysontechnologies.com/blog/how-to-convert-mbox-to-pst-with-free-methods/