Do you use Open Office?

I don't use either of those options.

M.S. office don't run on linux.
Open Office is malicious, it requires JAVA.

When we raffle off used systems to employees, I install OpenOffice.org (the complete name) on those systems. People are more inclined to buy chances on a system that's loaded with free legal software than one that has only an OS.

OpenOffice.org because I can, MS Office because I have to.

M$ at work, OO at home.

Microsoft Office at work and Open Office at home.

in windows ,i used MS office ,but in linux ,i used open office

I've been using Star Office 7 and just recently started using Open Office which I just installed on my laptop. I had been using MS Works 2000 up until the release of XP and picked up Star Office 7 which I got hooked on after being introduced to it's previous releases in Linux Red Hat 6.5 and Mandrake 7.
I tried the MS package and didn't like it. Totally intrusive, bloated, slow and ties you to only using Outlook Express which is still vulnerable to viruses and worms.
I switch between Star office and Open office.
I read about 5 months ago that Open Office was formally known as Star Office. Sun Microsystems told the linux community that they would no longer bundle it free with linux distributions such as Mandrake 8 (last one to have it). But both packages are great and they are faster than MS word programs.

Besides, Open Office has the best features for the price.

MS Office at work, because it's required.

I use OpenOffice.org at home, because I don't have $300 for MS Office Professional.

I can do almost anything with OO.org than I can with MSOP, and put it into MS's file format.

And like them both.