Cloud Computing is to provide software application service to the business organizations in a shared network over the internet. The business organizations need to subscribe to the service on the internet in order to use the application. The users of the system will have to connect to the internet using any internet enabled devices such as, desktop PC, Laptop, tablet or smart phone and access the application. The typical example for this kind of application is web email. The Gmail is very popular web based email application which is using the concept of Cloud Computing. The users of Gmail can access their email at anytime from anywhere in the world just by logging to the Gmail website using their User ID and Password.