{"id":17924,"date":"2026-08-18T17:01:05","date_gmt":"2026-08-18T08:01:05","guid":{"rendered":"https:\/\/m365jp.net\/?p=17924"},"modified":"2026-08-18T17:04:52","modified_gmt":"2026-08-18T08:04:52","slug":"servicerestored-ex1456866-exchange-online-some-users-may-be-unable-to-send-or-receive-new-exchange-online-email-through-the-native-ios-mail-app","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-08-18-servicerestored-ex1456866-exchange-online-some-users-may-be-unable-to-send-or-receive-new-exchange-online-email-through-the-native-ios-mail-app","title":{"rendered":"[serviceRestored] EX1456866 | Exchange Online | Some users may be unable to send or receive new Exchange Online email through the native iOS mail app"},"content":{"rendered":"
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EX1456866 | Exchange Online | Some users may be unable to send or receive new Exchange Online email through the native iOS mail app<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceRestored<\/td>\n<\/tr>\n
Classification<\/th>\nincident<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may have been unable to send or receive new Exchange Online email through the native iOS mail app.<\/td>\n<\/tr>\n
Last Updated<\/th>\n08\/18\/2026 07:17:37<\/td>\n<\/tr>\n
Start Time<\/th>\n08\/17\/2026 23:38:00<\/td>\n<\/tr>\n
End Time<\/th>\n08\/18\/2026 07:15:32<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users may be unable to send or receive new Exchange Online email through the native iOS mail app <\/p>\n

User impact: Users may have been unable to send or receive new Exchange Online email through the native iOS mail app. <\/p>\n

Final status: We reverted the authentication component changes utilized for Exchange ActiveSync and validated in our telemetry as well as with affected users that the impact was remediated. <\/p>\n

Scope of impact: Some users attempting to send or receive new Exchange Online email through the native iOS mail app were impacted. <\/p>\n

Start time: Monday, August 17, 2026, at 11:38 PM UTC <\/p>\n

End time: Tuesday, August 18, 2026, at 7:15 AM UTC <\/p>\n

Root cause: Recent changes to an authentication component utilized for Exchange ActiveSync were causing connection failures. <\/p>\n

Next steps: We’re continuing our analysis of the recent changes to isolate what triggered the initial impact which will help us in refining our update review processes to avoid impact in the future. <\/p>\n

This is the final update for the event.<\/td>\n<\/tr>\n

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