Original: File formats OOo can open, December 1, 2008 [ ] As with the entire OpenOffice.org suite, Calc can be used across a variety of platforms, including Mac OS X, Microsoft Windows, Linux, FreeBSD and Solaris.
Simplified: Just like the entire OpenOffice.org package, Calc can be used on many operating systems, including Mac OS X, Microsoft Windows, Linux, FreeBSD and Solaris.