OST files are offline cached copy of your data on servers, mostly Microsoft Exchange account, but also web-mails like Gmail. But the OST file can often become inaccessible or corrupt. Converting them into PST is a good solution.
“OST Extractor Pro” is currently the best and the most recommended software tool to convert OST to PST files with the integrity preserved. You will not notice anything missing from the output files. It converts all the images, attachments, and other minute details that are usually lost by ordinary tools. On top of that, it also features batch conversion ability, supports non-English text conversion, and is backed up by 24x7 customer support.

NOTE: It supports all Outlook version and both 32 bits & 64 bits system.
How it Works:
1. Add OST file to ‘OST Extractor Pro
2. Select output format as PST File (*.pst)
3. Click on ‘Export’
Super easy to work with it, must try. Download the free trial version and start converting OST to PST files like a pro!
Read More: OST Extractor Pro – Recover and Convert OST to PST Files Accurately!