I was looking for the solution for a long time ago, to convert OST files to PST file format. Then I acquire Free OST to PST Converter software and I got perfect results with it. The eSoftTools OST to PST converter software works smoothly and make easy recovery of OST Mailbox emails, attachments, whole elements of email messages without losing any data. This excellent tool can easily extracts their data into several file formats such as PST, EML, Office 365, MBOX, MSG, vCal, HTML, vCard and EMLX etc. It also supports all Windows OS versions. The free demo version is available to analyze the functions.

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