Last time I checked, none of the online web two point ooh software can open big documents. These web-apps only match probably 20% of MS Office features and it's simply not enough these days when people are more tech-savvy than in the past.
Evolution:
-Mainframes as the computing platform (IBM)
--- PCs as the computing platform (Apple)
------- the OS as the computing platform (MS Windows) (Where Apple missed the boat by only offering their OS on proprietary hardware)
------------- the Internet as the computing platform (Google) (where MS will probably miss the boat)
every time I fire-up and use OpenOffice, I hear the 'cry' of another microsofty programmers` heart, breaking in two ... guess I fall in the second half.
1. It's free
2. It can read all Microsoft and open formats
3. It can export as PDF
4. It runs on Windows, Mac, Linux, ... (written in Java I believe)
5. It's open source
6. Various other features have been added which MS now adds to MS Office in order to catch up (like auto-completion).
MS Office is clearly under serious attack now, and I'm sure the OS will follow in a few years unless MS takes a major tack in their business, which seems unlikely but is possible. If you are a top-notch programmer brimming with big ideas, do you want to work for MS? Probably not, and I think that is the biggest barrier they have to succeeding in the new web world. You can buy programming mercenaries with enough cash, but the genius paradigm-shifters will be hard to find over at MS.