The simplest and best option is to use the import tool located within the Google Contacts interface. You can find the email and contacts import tool using these steps:
- Login to your Google Contacts account
- On the left, click More and then Import.
- Select the account you want to import from.
- Click I Agree, Let’s Go!
- Sign into your previous email account.
Note: If you have an Apple account, please read the following article.