Many users ask how to open an OST file directly in Outlook. However, Outlook doesn't directly import OST files, especially if they're orphaned, corrupted, or created from an old profile. The easiest and most reliable way is to convert the OST file to PST and then open it in Outlook. I've tried several methods myself, but the most stable and accurate results were obtained with the eSoftTools OST to PST Converter Tool. This tool deeply scans OST files of any size or corruption, recovers all emails, attachments, contacts, calendars, and other items, and then exports them to PST with 100% data integrity. After conversion, the PST file can be easily opened in any Outlook version. It also supports export to Office 365 and other formats. For those experiencing problems with OST files not opening, this tool from eSoftTools is the easiest and safest solution.

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