Quickly transfer single/multiple ost files by using Outlook OST file conversion tool which is the able  to restore ost file to pst file. This ost to pst converter software simply convert ost emails properties like- to, bcc, cc, subject, from, date, and, etc. With the 100% helpful solution of outlook OST to PST Converter app from KDETools Software to restore Outlook OST file to PST file easily. The Converter software to import, export, and migrate Offline Outlook data file in PST file with all email messages, contacts, calendars, notes, tasks, attachments, etc. in exact form. 
OST converter tool