One of the coolest feature of the future Office 2010 are certainly the new Office Web Applications, now not simply services offered via web but browser-based Office clients.
You can host an Office document for example on a Sharepoint site and edit documents directly by using the Office Web Applications (same browser page), with any browser… so cool isn’t it?
I’m curious to see what could happen on a mobile browser… can you imagine to work with your Office documents directly from your iPhone or Windows Mobile phone? This is productivity… :)
Excel Web Application
