The best and easy way to open MBOX file in Gmail account is using the Mailbox MBOX Converter Wizard on your computer. This allows you to securely and directly import MBOX to Gmail account including all attachments. Plus, it permits you to upload multiple MBOX files at the same time with full accuracy. The software does not need the installation of any MBOX-supported email clients to begin this task.

Steps to Open MBOX file in Gmail Account are:

1. Download and install the tool on your Windows PC.
2. Then click on Open > Email Data Files > MBOX files or folders.
3. Now, click Export and choose Gmail from the multiple options.
4. Finally, hit the Save button to begin this migration.