“Google” the most outstanding search engine also provides lots of services and apps for their users. You can get all those services with a single Google account. The most widely used services are Gmail & Gtalk, mail & chat services respectively. If you are having the Gmail account and you have used it for a long period, it might contain lots of contacts related to your business or friends. Some may still stick with the email id created long back only for the contacts it holds.
Here is the way to switch to a new Google account without losing any contacts.