Open Gmail Contacts. Select Google apps, then choose Contacts.
In the left panel, select More to display additional options.
To export an entire address book, select Contacts. Select the drop-down arrow to choose a Google Contacts group.
Choose an export format:
Download the file to your Desktop. The file may be named something like gmail-to-outlook.csv (for the Outlook CSV format), gmail.csv (for Google CSV) or contacts.vcf (for the vCard format).
After the address book downloads to your computer, import your contacts to another email account or restore the contacts to the original Gmail account.
Your list and file of contacts may be large because Gmail adds new contact entries to your address book when you reply to an email or forward it to a new address. These new automatic entries are found under Other Contacts in Gmail Contacts.
Go to Gmail and select Settings.
Go to the General tab.
In the Create contacts for auto-complete section, select I'll add contacts myself.
Select Save Changes.