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ost to pst converter free full version  tool is superb utility easily convert OST to PST and also transfer free unlimited ost to pst online with  Office 365, Gmail, Zimbra, Gmail, EML, EMLX, vCard, ICS, MSG, Live Exchange server, MBOX and etc.  its app quickly supports all MS Outlook versions Outlook2019, Outlook 2016, Outlook 2013, Outlook 2010, Outlook 2007, Outlook 2003 and easy to install all Windows OS including all lower and higher versions.

https://www.vartikasoftware.com/blog/OST-to-PST-Converter.html

You don't think that you should stay away from useless methods and need to go with the smart method. The OST to PST Converter is a smart solution it allows users to migrate the OST files into multiple file formats. You can convert the file into all the major file formats as per your need. Also, you can directly migrate the file content to email clients. So, you need not convert the file into a compatible format. Then, upload the file to respective email clients.