If you want to safely migrate your Outlook OST file to PST format, the best solution is eSoftTools OST to PST Converter Software. This advanced tool helps users convert inaccessible, orphaned, or encrypted OST files into usable PST files for Outlook without any data loss. The software supports the conversion of all mailbox items, including emails, contacts, calendars, attachments, notes, and tasks. With its simple interface, both technical and non-technical users can easily perform OST to PST migration in just a few steps.

You simply need to add your OST file, preview the mailbox data, and select PST as the output format. It also provides multiple saving options such as EML, MSG, MBOX, HTML, and more. The tool supports all Outlook versions and Windows operating systems. Using eSoftTools OST to PST Converter, you can recover and migrate OST data quickly, ensuring 100% accuracy and maintaining the original folder structure.
Read More:- Migrate Outlook OST to PST

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If you still have access to your Outlook profile, you can try exporting mail items directly to a PST using Outlook’s built-in Import/Export option. However, if the OST file is orphaned (for example, from a lost or inactive Exchange profile), Outlook alone can’t open or convert it.

In that case, you’ll need a dedicated OST recovery or conversion tool. I’ve personally used EdbMails OST to PST Converter, which can open even inaccessible or large OST files and convert them to PST without requiring an Exchange or Outlook profile. It also lets you preview the mailbox data before exporting, which helps ensure nothing is missed.

The process is pretty straightforward:
  1. Download and Install the EdbMails Application.
  2. Browse and select your offline OST file.
  3. Preview mail items, folders, attachments, etc.
  4. Export the data to a PST file.
It worked well for me when I needed to recover some offline Outlook data after a system migration.
 
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