Short description of Convert OST to PST 2.1: Convert OST to PST Recovery tool is a powerful exchange ost recovery utility designed to recover & convert emails from Microsoft Exchange Offline Storage files (OST) to usable Personal Storage (PST) file. Convert OST tool quickly recovers emails from Outlook OST files and then converts them from OST to PST file created using Microsoft Exchange 2003, 2000, 5.5, 5.0.