Click File > Save As. Under Save as type, click on the dropdown field. Scroll
down and look for PowerPoint Show (.pps). Click Ok.
Also, check this out:
"Send a presentation that opens automatically in email" http://www.rdpslides.com/pptfaq/FAQ00341.htm
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Shawn Toh (tohlz)
Microsoft Most Valuable Professional (MVP PowerPoint)
Site Updated: July 23, 2006
3 New PowerPoint Games http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate