Restore to normal size e-mail screen

My screen suddenly split in two and today shows a screen on the monitor and the other on the lower part of the top monitor!  How do I return to the original, normal screen after I connected and selected "mail" to display?  That's when he shows 2 screens.  HELP PLEASE?

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http://www.ehow.com/how_5958887_fix-split-screen-XP.html

Tags: Windows

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