No, Tech Tool & Norton Utils are not needed for OSX. The only real maintenance utils that you need for X are Disk utility on the OSX Install disk & a freeware utility called Onyx: http://www.macupdate.com/info.php/id/11582 Scott -- "Never ask a man what computer he uses. If it's a Mac, he'll tell you. If it's not, why embarrass him?" --Tom Clancy On 6/9/04 11:27 PM, "Jane Sprando" <janesprando at comcast.net> wrote: > I have an iMac that boots into 9 and 10. I have a lot of utilities that I > use in 9, like Tech Tool Pro, CopyPaste, MacLink Plus, Norton Anti Virus, > Norton Utilities , etc... > > Do I need to buy the OS 10 versions of these software? If I do, should both > versions be installed? > > Jane