To export OST mailboxes to PST using Microsoft Outlook, follow these quick and easy steps. First, make sure you're logged into Outlook using the same Exchange account that was used to create the OST file.

🛠 Manual Method: Export OST to PST Using Outlook
Open Outlook and go to File > Open & Export > Import/Export.

In the Import and Export Wizard, select Export to a file, then click Next.

Choose Outlook Data File (.pst) as the export format and click Next.

Select the mailbox folder(s) you want to export, then click Next again.

Click Browse to select the destination where the new PST file should be saved.

Choose how you want to handle duplicate items.

(Optional) Set a password for the PST file, or simply skip this step to proceed.

Click Finish to start the export process.

Note: This method only works if the original OST file is accessible through its associated Outlook profile.

💡 Alternative Solution: Use GoldyTools OST to PST Converter
If your OST file is orphaned, corrupted, or inaccessible, or you prefer a faster, more flexible approach, consider using the GoldyTools OST to PST Converter. This professional tool allows you to convert OST files without needing Outlook or an Exchange connection, and supports additional formats like EML, MBOX, and more.

✅ No Outlook required
✅ Batch conversion support
✅ Maintains folder structure
✅ Includes date range filters and preview options