Microsoft provides a public service to render your office documents that are stored in a publicly accessible web location. This means you don't have to upload documents to SkyDrive, http://docs.com or install your own Office Web App server in order to have them displayed as HTML files.
Works for most browsers include Internet Explorer 7 or later, Safari 4 or later, and Firefox 3.5 or later, and Chrome. Also works on most smart phones.
Example from http://www.nt.gov.au/ntg/gazette.shtml
Generates a URL of
Another example for a PPTX.