Hello everyone... I have dragged my feet on upgrading to Lion as it broke too many apps for me. Now I am ready to upgrade, but there is still one app I cannot let go of (Quicktime 7 pro, vastly superior to the later versions). It is an essential part of my workflow, so what I am thinking about doing is installing a new harddrive in my mac and installing Lion on that, so that I have the option of booting into either OS. Here are my questions: Is this a bad idea? I have four disk drives in my mac pro (Quad Core Intel Xeon, 10gb ram), does it matter which drive the OS's are installed on? (I assume separate drive for each OS is essential). Assuming the install is ok as planned, I simply hold the C key while restarting to select a bootable drive, right? Answers and any other advice greatly appreciated. be gentle, I am a non-tecchie designer. Thanks!