This open source product is available as a free download for Windows, Mac, Linux and Solaris operating systems.
Whilst it might not have all the collaborative working option of Office 2003, most users really only use the very basic functionality that was available in Office 97
Although the early versions of OpenOffice were quite primitive, the 2.0 series does address that and short of a row height within table difference to Word, manages to make a good job of rendering even the most baroque files.
With the ability to create PDF's from any of its applications, it offers you options that are only mooted for the next release of Office
Download OpenOffice at:
Latest release at 19-10-2006 - 2.0.4
Available for Windows 2000/NT/XP, Linux Kernel (>2.2.13), Solaris 8
(SPARC and X86 ), Mac OS X (with X11 libraries)
Download from here
If you wish to install on a Mac, currently you will have to install the X11 libraries as a native Aqua version is not available at time of writing.