[Uri’el-2012]

Most people don't keep computers more than five or six years. It makes no sense to upgrade the OS version on an old computer.

I'm typing this on a six year old iMac
running the most current OS X (10.5.6)

it is absolutely seamless.

[js1138]

That’s because Apple charges for service pacs and calls them new versions. How many times since OSX has Apple released a new version that cost the original users money?

XP users have gotten all the upgrades for the last seven years at no additional charge.