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Mac Powerpoint does not work well at all, nor does translation to video. If you pay for a year, you must cancel through PayPal, and there are NO refunds, even though the site states you'll only be billed for the current month. Customer support sounded like some sleepy guy in India is answering his phone... very shaky. For FREE, you can go to mybrainshark and get virtually the same service... FREE.
Don't bother. You can do better at mybrainshark.com