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If you want to know step by step OST to PST conversion process, then I would suggest you download a free trial version of Shoviv OST to PST Converter software to know its features and working steps.
Download from Here: https://www.shoviv.com/ost-to-pst-converter.html
(i) Open MS Outlook application, Select File option.
(ii) Choose ‘Archive’ and choose the folder(s) or file(s) that needs to be archived.
(iii) Browse the location to save the Archive file(s) or folder(s).
(iv) Then, click the Finish, to complete the process.
Use OST to PST Converter to recover corrupted and damaged .ost file and migrate it into office 365, Outlook PST file and more.
Download VOOK OST to PST Converter which is the most reliable for the users. This software converts entire OST Files to PST Format within seconds. It also converts more than one OST Files into PST Layout.
visit: - http://vooksoftware.com/ost-to-pst/
If you need to convert OST file to PST format there is a simple and secure solution that is OST to PST Converter Tool. It easily OST and backup OST file in PST format. It allows converting data such as Emails, calendars, contacts, tasks inside the OST files to PST file format. It also supports all Outlook Versions.
Users can use the free trial as it will save their time and money