Hi Jaqui, We've had good luck with Red Hat 8.0. As you might guess, we're pretty conservative about jumping to a new OS platform. R'osity currently requires 4 front-end servers and a couple of back-end servers to handle the load. After working for a while to get that right, we are fairly cautious about running with the latest stuff. Even 8.0 does not always handle multiple processors and large memory spaces properly in all cases. Tim