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I use the default mail client like many Mac users do and ever since the switch from Snow Leopard to Lion many have wondered how to change the orientation in the client from the horizontal back to the vertical and today I`ll show you how to do so!
1. Open the Mail application
2. Press Command and , (comma) to go to the preferences
3. than under the viewing tab click Use the classic layout
4. go back to mail and it should of changed!
Image Source: I took the image (just started putting my watermark in)