Launch Mac MBOX Converter as an administrator on your macOS.
The software shows you two options: Single File or Multiple Files/Folder. Select either one and click Next.
In the new window, choose either Select File or Select Folder as you want to add the MBOX files.
Click on the Browse button to add MBOX Files from the system. Click Open to upload them.
Further, recheck the added files. You can add new files or remove the ones already added. Click Next.
Now, preview the files and folders from the tree structure by double-clicking them. Select to convert and click Next.
Afterward, choose PST from the drop-down list of Save in File Formats to convert MBOX files.
Choose this option to exclude duplicate emails on the basis of To, From, Subject, CC, and Body.
Furthermore, choose the below-given options for the new file:
Choose this option to specify a date range for specific mail migration for a particular period.
Use this option to provide a unique name to the resultant folder for quick access.
Click Path to Save to provide a location for the new file to store the data.
Lastly, click Convert to initiate the MBOX to PST conversion on Mac.
Now once the process completes, click OK and hit Download Report to save the conversion report.
Follow steps 1 to 6 as before in Conversion to File Formats and then continue with the steps given below.
Now, select the option Save in Email Clients and choose Gmail from the drop-down list.
Click Modern Authentication, enter your Gmail ID, and click Sign In for authentication.
You will be redirected to the browser. Here, complete the authentication process and you will receive a message as shown below. Close it and go back to the tool.
Use the Remove Duplicate option to exclude similar emails based on To, From, Subject, CC, and Body
The software provides you with two options for attachments. However, you can only choose one at a time.
Select any of these filters as per your need:
At last, click Convert to start the MBOX to Gmail migration process.
Once it completes, click OK and hit Download Report to get a detailed overview of the conversion. Also, click Convert Again to restart the process.