Will OSX 10.8 support splitting the HD in order to also run 10.6.8?

I am running an iMac and have just upgraded to OSX 10.8 from 10.6.8. Now I have notices saying some programs are unsupported. I want to partition the hard drive so that I can run the older apps in 10.6.8. Is this possible?

Welcome to Apple Support Communities
Of course. You just have to use Disk Utility (in /Applications/Utilities) to create a second partition formatted in "Mac OS Extended (Journaled)" > http://pondini.org/OSX/DU3.html
After doing that, insert the Snow Leopard DVD, hold the C key while your Mac is starting and point the installer to install Snow Leopard onto the second partition. After installing it, open  > Software Update, and install the most recent version. If you need to run PowerPC applications, you can select Rosetta as an optional install.
Doing this, your Mac will start up by default in Snow Leopard. If you want to start in Mountain Lion by default, open System Preferences > Startup Disk, and select the Mountain Lion partition.
You can also install Snow Leopard Server onto a virtual machine by purchasing it by phone, but it's not recommended if you need the best performance. Also, you will have to spend more money and it will slow down Mountain Lion if you haven't got enough memory

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