You may have many email accounts, one with yahoo, another with hotmail and one more with gmail. It is really difficult to manage all and time consuming to check emails in all accounts. Now gmail made it easy to import all your emails and contacts from other accounts to gmail account.
Gmail now migrates email and contacts from other email providers, including Yahoo!, Hotmail, AOL, and many more. It's much easier to make the transition now that you can bring along all your old email and contacts. You can even have your messages forwarded from your old account for 30 days, giving you time to take Gmail for a test drive while you make up your mind.
This new feature is available in all newly-created Gmail accounts, and it is slowly being rolled out to all existing accounts. It'll take longer than the few hours or days that most Gmail features take to get out to everyone. You'll know it's on for your account when you see the Accounts and Import tab (formerly just called Accounts) under Settings. Businesses and schools using Google Apps won't see these new migration options.