Actually OpenOffice rules with 6 to 8 million downloads per year (current rate of downloads). And, of course, one can make unlimited copies of downloads. The sourcecode is being downloaded at a raate of 500,000 per year.
MSOffice may be 30% of revenue but it is 40% of profits.
StarOffice may have sold about 2 million copies by now. But each copy may be installed on 3 computers.
Licensing of StarOffice to Academic institutions may be 5 to 15 million copies a year.