I mistakenly upgraded my MBP way to far, To Yosemite. My stats are in my signature. If there is a thread I couldn't find, please link in your reply. I would like to use a 40GB External HD, throw on there my files, passwords, FF browser links and things and then do a clean install of the best choice OS for this build Macbook Pro. I'm just not certain how far ahead I can safely go. I would trade performance for "Latest and greatest", So if Leopard is the best I can do and run smoothly, so be it. Any advice or tips would be greatly appreciated....as...I ..am..now using my work computer at home...windows Thanks in advance for any replies. --- Post Merged, Jan 24, 2016 --- https://discussions.apple.com/thread/4985676?start=0&tstart=0 You can purchase Snow Leopard from the Apple Store and update it to 10.6.8. PPC apps will not run in Lion or Mountain Lion so, if you have a lot of old software, you should stop there. If you want the latest OS you can skip Lion and go directly to 10.8.3 via the App Store app found in Snow Leopard. None of Apple's newest software or OS's ship on DVD's and all must be purchased and downloaded using the App Store. If you have a slow internet server stop at Snow Leopard. Does anyone disagree with the above ? If so, why ? All I do is internet, videos and pictures. I do not game or anything Video card heavy like that.