- Joined
- Apr 4, 2007
- Messages
- 2,641
- Reaction score
- 134
- Points
- 63
- Location
- Durtburg, WV
- Your Mac's Specs
- Sooper Fast!
When an Apple OS is upgraded, how does it do it? I'm talking on a technical level. Is it as good as a fresh install, or does it leave bits of code and files from the old OS lying around?