File formats are identical between OpenOffice and StarOffice and with the previous versions (1.0 and 6.0). OpenOffice 1.1 is available for Linux and Windows. These versions are essentially identical. The Mac OS X version of OpenOffice is 1.0 as I write. File sharing is still possible, but some functions of the program are a level back. The Mac version is not native but based on X11. Between the back level and the nonnative issues, I have found the Mac version of OpenOffice to be too slow and with a poor on- screen format. This will be fixed in a few months. At the moment, there is a version called NeoOffice/J, using a Java front end, that is fast and presents very well.