If you want to open an OST file in Outlook but can't get direct access, the most effective solution is to use eSoftTools OST to PST Converter. This software scans orphaned or inaccessible OST files and converts them to PST format, which you can easily import into MS Outlook. With this tool, you can preview emails, contacts, calendars and attachments and export them safely without data loss. Just select the OST file, scan it, create a PST and open it in Outlook.

Read More:- Open an OST file to Outlook