You just need to follow these steps to convert OST to PST file format. Step 1: Firstly open your Microsoft Outlook. Step 2: Then click on File and then Archive. Step 3: After that choose your file/folder to archive and Browse the location to save to save your file. Step 4: Click on Finish. I hope you find this method helpful for your question.Can you convert an OST file to a pst file?
Using an OST to PST converter tool, you can convert large-sized OST files and inaccessible and orphaned files to PST format. You can also export the OST file directly to an existing Outlook profile, Office 365, or live Exchange. You can download the software for free to convert OST to PST.