Hi, Check this out:
"Mix Portrait and Landscape slides in a presentation"
http://pptfaq.com/FAQ00042.htm

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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: May 19, 2007
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> I'm trying to change the setup of one page to landscape in a Ppt document
> that has been set up in Portrait set up? I can do this in Word but how do I
> do it in PPT? Thanks, K