I recommend you to give a try Yota Email Migration Tool. This professional tool easily import MBOX to Gmail, Outlook, Office 365, IMAP, etc. Also, this software is useful for all users whether they are professionals or new users. Additionally, this tool is compatible with all the latest and older editions of Windows Operating System. You can also preview the files before importing.
Importing MBOX to Gmail without data loss can be done efficiently using professional solutions like the Shoviv IMAP backup and restore tool. This tool ensures a secure and accurate import process, preserving emails, attachments, metadata, and folder hierarchy. Users can easily upload multiple MBOX files to their Gmail accounts in one go, saving time and effort. With advanced filtering options, it allows the selection of specific emails for import based on date, subject, or folder. The tools user-friendly interface makes it suitable for both technical and non-technical users, ensuring a smooth MBOX to Gmail migration without risking data integrity.