Why are you trying to compete with google docs?
I know that TinyMCE provides some advanced controls for editing in the browser. The last time I looked at him, he had 100% of the material that I would normally use in a word, and then in another. On the other hand, I probably have 1% of the possibilities provided by MS word. It would be very difficult to implement all this.
As for saving in MS Word format compatible. I am sure it is possible. it would probably be easier to save in a format other than doc. As for pop-ups, etc., they can be easily created using jQuery UI or any other javascript infrastructure.
Bottom line: yes, maybe, but why ?!
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