Microsoft Office remains dominant, with 51% of American internet users over age 18 using it, according to a 6-month study conducted by market researcher ClickStream Technologies.

OpenOffice.org was used by 5% of people, versus Google Docs' 1%, according to the survey of 2,400 users on their home PCs conducted between May and November of this year. OpenOffice.org was also found to be used more often, 8.7 days, versus 1.5 days; and longer, an average of 9.3 minutes, versus 3.4 minutes for Google Docs, according to ClickStream's panel, which was two-thirds comprised of women.

During a , Ballmer said: "We have better competition today than Google Docs and Spreadsheets. We get more competition from OpenOffice and , frankly."

Microsoft is poised to cement that domination with its , and , to be announced on Monday.

The latest version, OpenOffice.org 3.0, , with more than 3 million downloads in that time. After one month, OpenOffice.org 3.0 had been downloaded 10 million times, the group said.