If you have an orphaned OST file and want to access it in Apple Mail or Thunderbird, direct import isnt possible. OST files are tied to Outlook or Exchange, making them inaccessible otherwise. While manual tricks like syncing via Gmail or Thunderbird exist, theyre time-consuming and risky. The easiest way is to use a professional OST Converter Tool. It converts OST files to MBOX quickly, supports bulk migration, and ensures all emails, contacts, and attachments remain intact with zero data loss. Thats why most professionals suggest using an advanced OST Converter Tool. It works without Outlook, supports bulk migration, and preserves folder hierarchy along with attachments. This makes it the safest way to import OST files into MBOX for smooth access across different platforms.