On the second PDC 2008 day, Microsoft has announced that the new Microsoft Office 14 will come with a built-in Silverlight Web version. Its probably a compact” Office version, but nobody knows it for sure yet.
Microsoft announced the web version of Word, Excel, PowerPoint and OneNote, and we can also expect that all those applications will run on any operational system with Silverlight support. What do you think about it? Check out some screenshots here.
I dont think its a big deal that other web application developers have to worry about, because people hardly change from Microsoft Office to a very limited office web application, like Google Docs.