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Teaser?

It's not a stripped version of PowerPoint with a timer on it. It's a viewer. If someone made a PowerPoint 2007 viewer released under GPL, you would probably urge this professor to use that. But, if distributed by Microsoft, it's poison that's not to be trusted.

Maybe, but that's not what I meant. It's a teaser in the viral marketing sense, kinda like how Paypal lets you "send" money to people who have never previously even heard of the service. It's a way of getting them hooked.
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Office 2007 Home and Student contains PowerPoint and costs $127 retail. A far cry from $500.

Both of which are an even further cry from *free* and open: OpenOffice.org, which can save compatible powerpoint files if need be.

Cheers