(Disclaimer: I worked on the Word Viewer Web App last summer) One of the things I think differentiates this from Google Docs, albeit for a small subset of user

(Disclaimer: I worked on the Word Viewer Web App last summer) One of the things I think differentiates this from Google Docs, albeit for a small subset of users, is that equations created in the rich client's equation editor are rendered in the viewer (it just so happened the only Word doc I have on Sky drive is a problem set). Most people won't care, but it's pretty nice if you do use it. My pet use case: If you keep your stuff on Skydrive (I don't...yet) and need to print from a non-Windows machine, it's nice not to have to have emailed oneself a PDF generated by the rich client. Being able to edit the equations would be great, but perhaps unsurprisingly, that's beyond the scope of the 1.0 release.