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 If you want to convert free and unlimited OST files then you can use the free and most demanded software on the internet that is SysInspire OST to PST Converter tool. This software can easily convert any OST file into different formats without any error and loss of the data in the OST file that is Calender, Contact, Background, Font Size etc. it can also convert the OST file into many formats like VCF, CSV, HTML, Zimbra Desktop, IMAP Account, EML, EMLX, CSV, Yahoo Mail, MSG, Office 365, PST and many more. You can take its free demo in which you can convert 25 items from each of the OST file and folder.

Know more :- convert free and unlimited OST files