You can go with Enstella OST to PST Recovery Software can convert ost files into pst This software has a few steps to convert OST to PST files.
Now Try the software conversion steps such as:-
1. Download this software and install this on your systems. 2. Choose the conversion formats like OST to PST, EML, MSG, ELMX, MBOX, HTML, Zimbra, VCF, & ICS, and mailbox items. 3. And Click the conversion switch to convert your formats, after a few minutes conversion is complete.
Are you interested in this software, Now try this free demo version and free to convert 25 items of every folder & subfolder.