Sorry I have to give you guys credit first before I suggest something.  What 
you have done is incredible.  

Please forgive for making this comparison but I truely belive that you can and 
will dominate the market if you have the same fuctionality as Office.  The only 
componet your missing is a mail apps simular to outlook.  I believe that if you 
had this functionality you would start to see success stories of corps 
replacing competitors with your software.  Now the other side of this is you 
would have to have traing to get user famalir with your product. I'm sure 
everyone that logs in has a big idea that will help break up the dominance but 
all of the alternatives suffer from the same issues of lack of some 
functionality.  I've tried everything that I can to replace office but I still 
need Outlook.

Now would you have to start from scratch? I don't know but are you familar with 
evolution?  I think this is also open source to some extent.  MS built most of 
their reputation on functionality and inovation - with enough focus perhaps we 
can beat them at their own game.