Accurately Displaying PowerPoint Files Through a Website

I want to be able to have users upload PowerPoint files up to our website, and then have the ability to display those presentations on our website.

Ideally I want to achieve as many of these criteria as possible, hopefully all of them:

• Accurate slide reproduction (the web presentation should look as close to the original PPT file as possible)
• Support all of the Animations in each slide (transitions from one slide to another, animations within each slide, etc)
• Support custom fonts
• No Iframes or embedding code necessary, the user just has to upload the file to us
• No watermarks or embedded logos from 3rd parties or Microsoft themselves
• No web plugins required (Flash/Silverlight etc)

Is there a solution out there that achieves as many (preferably all) of these criteria as possible?