Can I use a 10.6.1 install disc to "active install" on a 10.5.6 mac? The support told me to active install, but we can't find the original install disc, but have the new one.
If you upgrade with you 10.6 disc, you will be running 10.6. The general consensus is that it's better, and you'll probably be fine with it unless you have some applications that won't run in 10.6.