I am here to recommend you one of the best tools that can migrate OST to PST very easily. It has no limitations on the conversion of OST files and quickly converts all OST mailbox components, emails, attachments, contacts, calendars, etc. Enstella gives you a spilled option for OST Big files converts small file sizes. This software gives a free demo for all users and a 30-day money-back guarantee.
Know More - Export PST file in Outlook
Know More - Export PST file in Outlook