Save your presentation file - Microsoft Support

Save your PowerPoint file as one of several formats, to a folder on a local drive, CD, DVD, flash drive, or to your laptop or desktop.

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Save a copy of your presentation with PowerPoint for the web

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Saving ppt to pptx or pptm - Microsoft Support

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Save a copy of your presentation with PowerPoint for the web

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Save a Presentation for PowerPoint 2007 : Presentation Save