Within Microsoft Outlook, OST (Offline Storage Table) and PST (Personal Storage Table) are two important file formats that store mailbox information. While OST files enable offline access to mailbox data, they are bound to a particular profile and server. PST files, however, are portable and best suited for backups, migrations, or recovery of data. If you're working with orphaned OST ... https://blogulr.com/vedprakashvMail/howtoconvertostfilestopstformatquickly-138111