Supporting old OS by Apple: of course they want you to upgrade, to profit.
I would not say that's because Apple is brave, it makes business sense.
Correct me if I'm wrong here, because I don't have the figures to back this up, but I'd imagine most of Apple's revenue from Macs comes from the home, rather than a business environment. It's easier to convince a home user to upgrade to the latest and shiniest version than it is to convince a cautious and conservative IT department.
not necessarily. MSFT doesn't make PCs, unlike AAPL.
I was given a free 2008 MacBook 13" in colledge. It came with Mac OS 10.5.2 installed, which couldn't run some new programs, so I did an update and it updated to 10.5.8 which solved all my problems so far. Are you supposed do buy an OS upgrade? Or buy a new Mac?
Upgrades are easy and preserve all your stuff. No need to format or anything.
Of course you can buy a new Mac too.