Indeed...on a 1400/117 with little RAM, i probably wouldn't go much further than...8.1. However, a 1400 with a quick enough CPU (either a 166 or a G3) and enough RAM can easily handle newer OSes...i have 9.1 on my 1400c/166, and unless i start browsing the web, or something else as CPU intensive, it really runs very nicely, no complaints at all. My only real complaints with the 1400 are the slow video, and the fact that Mac OS 9 doesn't support WPA secured WiFi networks.