If you have Backup Mbox files of Mac Mail/ Apple Mail and want to Convert them as PST file please Create a folder as Below and keep those Mbox files inside the Mailboxes folder. Start Apple Mail to PST Converter and select only Mail folder and click next, kindly do not go inside the folder otherwise it will not detect any email folder neither the complete folder structure of Mac Mail.
Create “Mail” folder then inside Mail create “V2” and under V2 Create “Mailboxes” and copy all the .mbox files to Mailboxes folder.
Alternatively please follow below process
First, we need to take backup of Apple Mail Database (Mails library folder on your Mac) and then use a portable drive to Move it to windows PC. Now you are ready to convert the Apple Mail Database using Apple Mail to PST Converter Software on your PC.
To locate and convert using Apple/Mac Mail Database, please follow below steps:
Apple/Mac Mail stores emails in a “Mail” folder (located inside user library folder) on your Mac. Please follow these steps to copy your “Mail” folder to this computer using an external drive or network shared volume.
1. Open a new “Finder” window on your Mac.
2. Click on Main Menu > Go > Go to folder. (Or press shortcut Cmd + shift + G). A dialog box appears.
3. Type ~/Library in “Go to folder” dialog and press Enter. Search for mail folder in the finder window.
4. Select the content of the folder displayed in “Mail” folder (opened in step 3) and copy it to an external drive or network shared volume.
1. Download and install Apple Mail to PST Converter software and install it on the Windows PC. Now Connect the Portable external drive on which you took the backup of Apple Mail database from the Mac.
1. Launch Mail to PST converter software and Choose the First option to Convert Apple Mail Database. Click Next
2. Click on “Browse” button located below and select the Mail Folder, do not go inside only select Mail folder and click open
3. Click “Next” and you would be displayed the folder selected.
4. Click Next and you would be asked to name the PST file and a location to save it.
5. Click Save and the conversion is started.
6. Once done click the Locate button and we are done.