OST files store mailbox data locally when using Microsoft Exchange or IMAP accounts. However, they become inaccessible if the Exchange server is unavailable, the Outlook profile is deleted, or the account is no longer active. Converting OST to PST ensures that you can safely access, back up, or migrate your mailbox data, including emails, contacts, and calendars, even without server connectivity. It’s especially useful when moving data to another system, restoring lost accounts, or accessing emails outside Outlook. Aryson OST to PST Converter simplify this process by offering secure, accurate, and bulk conversion of OST files to PST and other formats without data loss.