Since I transitioned to training (and loving it), I've been pondering how best to have multiple people work on presentation decks at different times just like one does with source code. PowerPoint being a "binary format" doesn't really allow for this. Yes, there's the built-in Compare & Merge functionality, but in practice it really has not worked out well for me. Testing this out with PP for Mac 2011 on multiple presentations resulted in EVERY SINGLE slide being declared as modified. It has promise, but simply doesn't deliver for me. If you've had better experiences, please leave a comment below as I would be glad to give it another chance.
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