Try CubexSoft OST to PST Converter Software for Mac & Windows to convert unlimited OST files to PST file format including all emails, contacts, calendars, and other data without any data loss. This software allows users to batch move Outlook OST file to PST file format without opening Outlook. It has a very simple GUI, everyone can easily handle and manage the software without any help. With the help of this program, users can convert OST to PST, PDF, MBOX, EML, MSG, Office 365, Thunderbird, etc. Download the free demo version of the tool and convert the first 25 items without any cost.