Do you use third-party apps like Outlook that access Apple’s iCloud but don’t support two-factor authentication? You’ll now be forced to enter a specific password for each one. Following a notorious celebrity hack, Apple updated iCloud with an extra security layer used to protect accounts by sending a four-digit code to your personal device. However, many third-party calendar, contact and email apps that access iCloud don’t support two-factor, and could therefore expose your iCloud password — and all your personal data — to hackers. Apple said that if you’re signed in to one of those apps when the change goes through today, you’ll be signed out and forced to generate and enter a new password.