I have a 2009 MBPro running OS10.9.5. I had to restore the system and all files which I did from a copy made automatically by TimeMachine, after the Apple genius had put in a clean basic system again for me, once everything had been wiped clean.
I then as advised threw across the additional files from the TM copy I would need.
My problem is, when I copied the Apple Mail program back from the Applications on the storage disk copy by TM, it did not reproduce the old mail folders and I just don't know where to find them. TM must have copied them somewhere, but maybe they are kept invisible by the latest systems?
If you could help me know where i must look for them and how to reinstall those mail folders it would be most useful. The Mail programme I pushed across does work, but it just doesn't seem to have the old folders with it. It just downloads new mail.