There is only one tool that can help you convert your data into various formats like PST, EML, MSG, vCard, vCal, EMLX, MBOX, and HTML with full accuracy and without any data loss the name of that tool is SysOZ OST to PST Converter. This tool can also support the cloud based applications like Office 365 and Live Exchange Server. You can also see the preview of this conversion before the actual conversion. This software can also do the selective conversion of the OST files.
You must recognize that both these email clients, OST and Outlook, support different file formats. Outlook supports OST Storage ability format while Outlook doesn’t support such format. Outlook client creates an Outlook data file in PST or Personal Storage Format. So, if you would like to migrate your OST database to PST Outlook, you must perform a conversion of OST to PST format.