Microsoft Office 2004 will work in Snow Leopard but not in Mountain Lion. So I keep Snow Leopard on a partition of my hard drive for purpose of doing scans. I have an expensive scanner with software that is very costly to upgrade in order to be compatible with Mountain Lion. The advantage of installing on another partition is that you can then have a multi-boot Mac, and can start in Snow Leopard instead of Mountain Lion by pressing the OPTION key during start-up to switch OS partitions in order to work with any software or drivers that are not compatible with Mountain Lion. If it finds it will ask if you want to import OS settings, applications and/or data from a partition with older OS. During the installation of the upgrade, the installer will search your Mac for partitions with older OS. When I upgrade to a new OS, I do so on a blank, separate hard drive partition. Check your printer and scanner software to see if drivers are available for Mountain Lion. Look through your software and see if your software is compatible with Mountain Lion, or if software has relatively inexpensive upgrades to make it compatible.
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