You can export your emails from Outlook directly to a PST file. Just open Outlook, go to File > Open & Export > Import/Export, choose Export to a file, then select Outlook Data File (.pst). From there, pick the folders you want to archive, set a destination, and finish the export. This is great for basic archiving, but it can be time-consuming and sometimes problematic if your OST files are corrupted or large.

Aryson OST to PST Converter Tool:
For a smoother, more reliable experience—especially if you need to archive old Outlook emails to PST from corrupted or inaccessible OST files—this tool is a lifesaver. It safely converts OST files to PST while preserving your email data, attachments, and folder structure intact. Plus, it supports batch conversion and works with all Outlook versions. It’s perfect for users who want to archive old Outlook emails to PST without hassle or data loss.