My Macbook Pro under Sierra needs repair. While it is being repaired, I am reverting to an old machine running Yosemite. Does anyone know if the format of Apple Mail files has changed between Yosemite and Sierra?
My idea is to copy Library/Mail from the machine for repair to the Yosemite machine. Will that work? Are there other files (for Apple Mail) that I should copy before taking it to the repair shop? Presumably plist files should not be copied over.