OSX 10.10.3 Mail lost all mailboxes
After update, all my mailboxes do not appear in the mailbox column. Before I had a number of mailboxes for each mail account, sent, deleted, junk, in each account and a number of mailboxes that I stored saved messages into. None of these show up in the mailboxes column any more. In fact, nothing shows in the mailboxes column. How do I get this stuff back to show up?
John C H