third-party software
accessing iCloud data
now need own password
Using app-specific passwords
App-specific passwords allow you to sign in to your account securely when you use third-party apps with your Apple ID.
App-specific passwords are single-use passwords for your Apple ID that let you sign in to your account and securely access the information you store in iCloud from a third-party app. For example, use app-specific passwords with Microsoft Outlook, Mozilla Thunderbird, or other mail, contacts, and calendar services not provided by Apple. App-specific passwords maintain a high level of security and help ensure your Apple ID password won’t be collected or stored by any third-party apps you use.
To generate and use app-specific passwords, your Apple ID must be protected with two-factor authentication.
If you don’t have devices that can be updated to iOS 9 or OS X El Capitan, you can set up two-step verification and generate app-specific passwords.
