Download iSpring Free as add-in for conversion of your presentations into Flash Format. It automatically appears as a toolbar under your Powerpoint standard toolbar. Just click the Publish button and you'll be able to transform your presentation into a website (with flash animation) consisting your presentation.
After converting to Flash, you can then view your presentation on your symbian mobile phone, too by using Flash lite for Symbian (read my previous post)
http://www.ispringsolutions.com/products/ispring_free.html