If you need to import Apple Mail to a Gmail account, you can do so with the support of the eSoftTools software, which will convert all of your problems related to Apple Mail to Gmail conversion. This software will convert MBOX files from the location you specify. It can migrate multiple MBOX files as well as a single MBOX file. The resultant PST file from MBOX is in the Unicode form so it's easily open in MS Outlook. Apple mail support mbox file format. It can also offers free trial pack to all users to convert few initial 25 items from mbox to others formats.