How to transfer all emails from an old email account to a new email account without forwarding one by one?

The old email account and the new one are @sbcglobal.net under two different DSL service line.
How to transfer all emails from an old email account to a new email account without forwarding one by one?
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Reply:You may get many answers, but to be very realistic you can't do that.
Reply:You can create an offline folder in the old account on your hard drive, then point the message store in the new account to the same offline folder. But you have to move all your old emails into the offline folder.
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