On Feb 10, 2010, at 2:13 PM, Paul Moortgat wrote: > Will it give problems to have more than one OS in the same Mac? > > Paul Moortgat Not in my experience. Simply partition your boot drive to have as many partitions as you need, and install one version of OS X to each partition. I have one for Leopard, one for Snow Leopard. They don't interfere with each other at all. As you know, if you are in one version of OS X and want to be in the other, you will have to log out on and log into the other, but that's no big effort. zc