Try latest algorithms for better results third-party software of KDETools for OST to PST Converter. This is a simply import any size of .ost files into PST files with save all mailbox attachments. The software gives best benefits feature to convert OST file/folder into PST Outlook format by using batch conversion option.
To Import PST to OST by KDETools Outlook OST Suite, steps are given below:-
• Free Show preview data conversion.
• Export OST file to Outlook included 14 plus file formats such as PST file, Office365, Exchange server, vCard, EML, EMLX, MSG, Gmail, Zimbra, MBOX and etc.
• Split large PST files ( 25GB)
• Message filtering option.
• No File size limitations
more info- how to convert ost to pst manually