Through ost to pst converter open source tool, users can convert Emails, mails from OST file to PST file and also save their OST data into MSG, HTML, RTF, Cal, and vCard format. It also exports OST data into Office 365, Live Exchange Server, EML, MSG, and HTML Formats. Users first download its Free unlimited OST to PST Converter online demo version and test the tool and also convert the first 30 data items per folder.