Google has announced that the will be identifying inactive email ids and sending them a notification email on those ids. If the user logs into the account, then the account will be saved. If there is no log in, the account will be deleted. However, just logging in is not enough. You will have to perform some actions to show that you are indeed interested in keeping the id. You can so anything from accessing your Drive, watching a YouTube Video using that id, and the account will be safe from the purge.
