Try advanced KDETools OST to PST converter tool which is specifically designed for converting Emails from OST to PST Outlook format in no time. It preserves the email propertiesTo, Bcc, Cc, Subject, from, date and etc.
• Migrate Files, folder items from OST to Outlook PST.
• Export OST to PST with [Attachments], Office 365, Gmail, G-Suite, Exchange Server, MBOX, MSG, EML, Office 365, Exchange Server, and etc.
• Export OST in PST, MBOX, Office 365, Exchange Server, and etc.
• Convert Meta Properties such as- To, From, Cc, Bcc, Subject, Date and etc. without missing any items and save data into new Outlook PST files.
• Technical support 24x7 for any query or doubts.
Mor info- How to Convert ost to pst manually