What are the steps to export OST file to PST in Outlook 2019?

[Alex_bill]

You can use Outlook 2019's built-in Import/Export wizard (File > Open & Export > Import/Export) to save an OST as a PST, but this only works if your original Exchange account is active. If your OST file is orphaned or inaccessible, the manual method fails completely. To export OST to PST without Outlook or Exchange dependency, using a professional Softaken OST to PST Converter is the safest way to move all emails, attachments, and contacts in a few clicks.