Obviously I can't confirm if this works but:

> How to embed PowerPoint presentations in your web pages.

> Once you've created the PowerPoint presentation, embedding it on a Web page is as easy as saving it to the Web, grabbing the embed code and pasting it onto your page - no code required. Visitors to your site will then be able to page through the presentation and interact with it directly on your Web page, from within the browser and without having to have PowerPoint installed.

http://www.microsoft.com/web/solutions/powerpoint-embed.aspx

That's Powerpoint "Online" which is just a webapp and doesn't actually use the Windows version of Powerpoint with the vulnerability.