In case you do not have enough time to convert all large OST items into PST Outlook, you can use FREE OST to PST Converter Tool of of eSoftTools. This converter Tool is the best option to convert large OSTY file into single and multiple PST file format without any size limit. It offers 6+ various formats for file conversion like HTML, PST Outlook, CSV, EML, MSG, Office 365, MBOX and vCard. It does not need installation of Outlook for converting OST file into PST Outlook and it smoothly functions with all file versions of Outlook such as:2000, 2003, 2007, 2010, 2013, 2016, 2019.
Know more:- Convert OST to PST