I would suggest you use MailsDaddy
OST to PST converter. Key features that must have in OST to PST converter like:-
Batch conversion: It allows the bulk conversion of OST files to PST without any data loss while maintaining file integrity.
Filter option: Users can sort data based on read/unread status, subject, sender, attachments, and more.
Export in another format: The tool can export OST files in various formats, including Office 365, EML, MSG, HTML, RTF, and many others.
Best GUI: The user interface should be highly interactive, enabling users without technical knowledge to operate it easily.
Supported on all Windows: The tool must be compatible with all Windows operating systems, including Windows 11, 10, 8, 7, XP, and others.