I have searched the forum to no avail. Here is my problem. I had two important e-mails I wanted to permanently save, so I created a new mailbox in On My Mac in the Mail program by selecting Mailbox/New Mailbox at the top. Then I dragged the files to On My Mac and put them in the new mailbox when it appeared below On My Mac. The files apparently went there, but now I can't get to them again! On My Mac is on the left side of Mail, just above RSS, but it is grayed out and for the life of me I cannot figure out how to get to my e-mail again.