Gmail now has the ability to view embedded presentations and PowerPoint slideshows. Previously, you could either download the presentation or view it in a trimmed HTML format.
It is interesting to see this feature, because not so long ago, Google
promised to make a tool for creating presentations in Google Docs. Gmail slideshows appear in Flash, although most Goolge services are made using AJAX.
There is also a new opportunity to “insert this presentation”, which allows you to add a presentation to the site.

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By default, you need to manually move to subsequent slides, but there is an option to automatically go to.

If you have a PPT / PPS application in your mailbox (type filename: .pps or filename: .ppt for the search), you can see for yourself all these possibilities.
via
Google Operatign System .