Keeping in mind that you might create a very large filesize presentation.
Save your presentation as a slideshow .pps/.ppsx (depending on your version
of PowerPoint) file and attach that to your email. the recipient must either
have the full version of PowerPoint or the PowerPoint viewer installed on
their system to view your creation.
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Michael Koerner
MS MVP - PowerPoint
How do I create an attachment consisting of a group of photos that will show
as a slide presentation using powerpoint?