To convert your OST files into PST in the smartest way you should definitely use PDS OST to PST Converter and that is a third party software which is available to download then and there easily. I will definitely suggest you to use this software which I personally used and happily satisfied with it, PDS OST to PST Converter this is the best and outstanding software I have come across, loved the interface and easy to use! Go and try it know: https://www.perfectdatasolutions.com/en/ost/convert-ost-to-pst.html
Grab the top vMail OST to PST Converter for Mac and Windows OS for a dependable and ideal way to convert OST to PST without Outlook. It enables you to bulk convert an Outlook OST file to a PST file, preserving all attachments and including all emails, contacts, calendars, tasks, etc. You can convert a large OST data file into PST format without any data loss because there are no file size restrictions. Additionally, this program is compatible with a number of file types, including PDF, MBOX, EML, MSG, Office 365, Gmail, G Suite, Exchange Server, etc. You can also convert the first 30 items for no charge using the software's demo version, which is available for free download.
Know more info- https://www.vsoftware.org/ost-to-pst-converter.html
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