It's not possible to open an OST file directly in Outlook unless it's connected to the original Exchange or IMAP account. If the profile has been deleted, the server is unavailable, or the OST file becomes orphaned, Outlook will not be able to access the file. In such cases, eSoftTools OST to PST Converter Software is an effective solution. This software safely scans the OST file and converts it to PST format, which can be easily opened and imported into Outlook. The tool recovers emails, attachments, contacts, calendars, and all mailbox items without any data loss and maintains the original folder structure.