Convert OST2PST - Version 3.2 If you are among one of the organizations, who are using Exchange Server to manage all emails of its employees then getting data from ost file is a common task for your system administrator. Extracting data from OST file is not a complex process with the SysTools OST Recovery tool. Install the software, browse the ost file and convert it into a format which can be opened or readable by a email client. Software offers 3 options to convert a ost into pst file. 1. PST 2. EML 3. MSG. These are common extensions for mail files or email messages, so are easily readable in common email clients. Try OST2PST FREE download and check if you can really export ost to pst file with ost reader tool by SysTools.