Office 2007 can save in "compatibility mode" which will open in 2003, 2000, and previous. Save as .PPT instead of .PPTX. This discussion is pointless.

Everyone using 2007 should be saving in compatibility mode. Every computing administrator should find a way to make that the default for every machine they administer.

When distributing a Microsoft Office document for viewing (not editing), it should be saved as a PDF. Period. Every computing administrator should train their users to do this.
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FireFox31
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