If you want to export Emails, sent items, deleted things, drafts, outbox contacts, inbox, calendars, and notes from OST to PST using the eSoftTools OST to PST Converter (To, Cc, Bcc, Subject, From, Object, Date, and Time). This application displays a preview before completing the conversions and saves the data to Office 365, which is a cloud-based application. If your OST file is large, you can split it up into numerous smaller PST files according to your needs. You can see a preview of the conversion. You may also convert 25 emails for free using the converter's free demo version.
Get more info- Convert OST to PST file
Get more info- Convert OST to PST file