For recovery OST files as well as conversion OST files & email, mails and etc. in new Outlook PST file by using Outlook OST to PST Converter software. It is the unique solution for converting data from OST to PST Outlook format and also split large size of PST files. Using it you can extract single as well as multiple OST files into PST file and another file format such as PST, Office 365, Gmail, Zimbra, Gmail, EML, EMLX, vCard, ICS, MSG, Live Exchange server, MBOX and etc. .

https://www.vartikasoftware.com/blog/OST-to-PST-Converter.html