Also per Apple.
Sign in securely with app-specific passwords
If you use iCloud with any third party apps such as Microsoft Outlook, Mozilla Thunderbird, or BusyCal, you can now generate app-specific passwords that allow you to sign in securely even if the app you are using does not support two-step verification.
To generate an app-specific password:
Sign in to My Apple ID (
https://appleid.apple.com)
Go to Password & Security
Click Generate App-Specific Password
App-Specific passwords will be required starting on October 1, 2014.