Select All The Text In A PowerPoint Presentation

-In the Slides tab you see miniature versions of the slides you're working on, but if you click on the Outline tab you'll see just the text that exists in those slides.

-When you have selected the Outline view, press CTRL + A to select all of the text in the presentation.

Src: http://www.wiseowl.co.uk/blog/s163/select_all_the_text_in_a_presentation.htm