Sinetempore, a user asked on Apple Discussions about exporting emails in High Sierra. I don't have a big folder to test. Can anyone verify is unlimited folder size is now limited? This is new to me: with High Sierra I am not able to export .mbox file larger than 2.15Gb. My Inbox is 2.9Gb, when I export it, the .mbox file size is always 2.15Gb!!! And if I import this 2.15Gb file, hundreds e-mails are missing from my original Inbox.