When you save it as a PDF file - are then any options that allow you to choose 'quality' or 'dpi' or anything along those lines.
Try lowering the setting.
Also see the Windows PC centric
Why are my PowerPoint files so big? What can I do about it?
http://www.pptfaq.com/FAQ00062.htm
cheers
TAJ Simmons
Microsoft Powerpoint MVP
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I am new to Mac - how come when I do a file save as on my powerpoint file (which is 25.5MB), it saves as a pdf file that is bigger than the original powerpoint file? I need to shrink it so I can email it out easily - to maybe 6MB - thoughts? Thanks!!