Short description of Nucleus OST to PST Conversion 7.05.01: Updated version of Nucleus OST to PST now offers to save the recovered emails in .PST, .EML and .MSG file formats; easily accessible with MS Outlook and Outlook Express. OST to PST conversion software designed to convert the unusable OST file to a usable PST file which can be imported and opened using Microsoft Outlook. Software restores all components from ost file including emails, contacts, calendar, tasks, notes and journals.