I have tried to recover my Archive >On My Mac folder in Mail. I opened Time Machine, found the deleted folder and clicked Restore. The screen returned to Mail and a dialogue box opened stating that the folder was being restored, but it wasn't. Time Machine is supposed to create a folder in the side bar of Mail which contains the restored e-mails, that didn't happen either. I'd be grateful if anyone can suggest a fix to recover these e-mails. My operating system is Sierra 10.12.3