PST is Outlook’s proprietary data container, whereas MBOX is a broadly compatible mailbox format used by Thunderbird, Apple Mail, SeaMonkey, and many Unix‑like tools, making it ideal for cross‑platform portability, vendor neutrality, and long‑term archiving. Outlook does not natively export to MBOX, so a conversion step is necessary when standardizing on open ecosystems or switching t... https://craneflower.net/blogs/26442/PST-to-MBOX-Converter-Software-vs-Manual-Methods-What-s