Install OS X 10.7 to 10-10 on MacBook Air MD232 I have MacBook Air MD232. As we need to test our software on all OS X from 10.7 to 10.10, we need to install them all. Is it possible to install them on my MBA? When I buy, this MBA has been installed with Yosemite. I tried to install any other OSs by using "restore" feature from Disk Utility. However, restoring process were successful and pressing alt/option during restart, I get only gray screen with a stop sign and nothing happen afterwards. Would you please tell me how?
Hardware Requirements

Every Mac has a minimum supported operating system. Older versions of OS X will not run on a Mac with a higher minimum.

For example, the MacBook Air (Early 2014) requires OS X 10.9.2 or later.

EveryMac has a comprehensive list of Mac models and their minimum supported OS X.

Virtual Machines

To work around this, consider using a virtual machine for your testing; VMware Fusion, Parallels, and VirtualBox are all reasonable choices.