I am having one issue regarding which i need your help. Actually my Macbook Pro is running with the Tiger on it and i wanted to install the Snow Leopard onto the same system. Does it is possible to perform the installation of the Snow Leopard on the Tiger. Also i wanted to know whether this will effect the data saved on the Tiger running machine. I wanted to backup all the data and use that with the Snow Leopard. If you are having the knowledge regarding the same then share with me so that i can perform the same. Thank you.