Hard disk failed which was running Mountain Lion but fortunately have a copy of the disk on external drive. Installed MacSierra on new drive and setup the email account. So far so good. Now I had a load of locally stored mailboxes but dont know how I can import them into Sierra. Obviously Migration Assistant isn't possible so need to know if it is possible to recover the info and the steps I need to take. If I just import mailboxes I assume they are not in the correct format? I have six years of locally stored info so desperate to get that back!! Any guidance appreciated Thanks