In its ongoing efforts to ensure strong security for customers, Apple will require the use of app-specific passwords from June 15th. This affects you if you use a third-party app that logs in with an iCloud email and password (Outlook, Thunderbird, etc) to access contacts, calendar and mail messages.
If you don’t migrate to app-specific passwords by the June 15 deadline, then those apps will stop working. Luckily, it’s easy to fix: read on for step-by-step instructions on how to make app-specific passwords for your Apple ID.
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