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There is numerous software available in the market for the OST to PST conversion but to choose one of the best is the most difficult task. For this, I would like to suggest you try VOOK OST to PST Converter. This utility assures users about 100% effective and error-free results.
This utility is capable enough to split the large OST files into the smaller ones and can merge them into a single PST file after the complete conversion of the data. The Offline OST to PST supports all the MS Outlook versions i.e. Outlook 2019, 2016, 2013, etc. The email properties and data integrity are well preserved by this software.
Visit here for more info:- http://vooksoftware.com/ost-to-pst/