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Move a message to another mailbox: Select a message, click the “Move to” button mailbox.
Show messages from several mailboxes: In the Mail sidebar, select multiple mailboxes.
Show messages from a specific email account: Click the arrow 
on your Mac, do any of the following:
Make text larger by pressing Command-Plus Sign (+) until the text is large enough for you to see. To make it smaller, press Command-hyphen (-).