There are numerous methods and tools available online to convert OST files to PST format but the most Outlook users suggest to use only ZOOK OST to PST Converter software. It is dedicated tool to recover and convert OST files to PST format including emails, contacts, calendars, notes, journals, etc. It is capable to convert any size or corrupted OST files without any data loss. Users can also split large size OST file to multiple PST files. It is fully supportable to all versions of Microsoft Outlook and Windows Operating Systems.