For Operating SystemsApple Mac OS X 10.0, Cheetah, Apple Mac OS X 10.1, Puma, Mac, Apple Mac OS X 10.3, Panther, Apple Mac OS X 10.2, Jaguar, Apple Mac OS 8, Apple Mac OS X 10.5, Leopard
I had to replace my hard drive on my Mac. When I went to reinstall my 2011 Office Home and Student, I found Microsoft no longer supported it and my key code would no longer work. I took a chance before spending $150 buying an upgraded version that maybe this $25 version of 2011 would work and it did! I had to install the disk and then call the number on the screen to activate and it worked!