I haven't used Mail.app since an incident about 2 years ago where it deleted a bunch of my messages. I was moving them from one folder to another when the conn

I haven't used Mail.app since an incident about 2 years ago where it deleted a bunch of my messages. I was moving them from one folder to another when the connection to the server dropped. I don't know why this should happen with IMAP (it is possible to move messages from one folder to another atomically) but it did.