I would like to share with you another amazing professional software i.e. CubexSoft OST to PST Converter Software. It is one of the best tools to convert Outlook offline.ost file to Outlook PST file format. It also converts all emails, contacts, calendars, tasks, notes, etc. along with attachments. This software was compatible with all the latest and below versions of MS Outlook, Windows OS, and Mac OS.
More Info: https://www.cubexsoft.com/ost/