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Exchange ActiveSync CBA ending: avoid “Can’t Connect” errors by migrating now

Configuration steps for migrating to Entra-based CBA (image Microsoft)
Microsoft announced on May 8, 2026, that it will retire direct certificate-based authentication (CBA) for Exchange ActiveSync (EAS) by the end of 2026. If your organization uses certificates to authenticate mobile devices against Exchange Online, you must migrate to a new method before the deadline, or your users' mobile email will stop working. This article explains what the change means, who is affected, and what steps you need to take.

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