For those of you that *REALLY* need MS Office and Open Office is not enough, then install wine just run this two commands on a terminal:
wget http://www.kegel.com/wine/winetricks sh winetricks msxml3 dotnet20 gdiplus riched20 riched30\ vcrun2005sp1 allfonts wsh56js
And then install using your installation CD.
UPDATE: If you are using a non-english locale the second command has to be:
LANG="en_US.UTF-8" sh winetricks msxml3 dotnet20 gdiplus riched20\ riched30 vcrun2005sp1 allfonts wsh56js
UPDATE 2: For Ubuntu 10.10 try just this:
Aftwerwards add an override for riched20 and usp10 to “Native then Builtin” using winecfg.