To import OST file in Outlook 219 and other versions including ( 2 23 27 21 213 216 ) take the help of converter tool. I would like to make your focus towards eSoftTools OST to PST Converter s Tool by using this program you can import OST file into multiple file formats like Office 365 MBOX CSV EML MSG vCard HTML PST Outlook . It does not require installation of MS Outlook for converting OST file into other formats and smoothly functions with all file versions of MS Outlook. You can also use FREE DEMO version available of this tool up to 5 emails can easily be converted into all formats.