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You can convert unlimited OST emails to PST files without an exchange server, even contacts, calendars, notes, tasks, etc, by using the Professional Solution DataVare OST to PST Converter Software. It has various high-level features that make the OST Conversion process too easy and fast without facing any errors. It converts single or multiple OST files into PST and other various file formats. Additionally, it works, and both all Windows and Outlook versions. For the satisfaction of users, they offer a free trial pack to all users which they convert the initial 25 OST files free to PST without paying any fee.
For More Info You can check on its site:- https://www.datavare.com/software/ost-to-pst-converter-expert.html