{"id":19006,"date":"2026-10-16T04:01:23","date_gmt":"2026-10-15T19:01:23","guid":{"rendered":"https:\/\/m365jp.net\/?p=19006"},"modified":"2026-10-16T04:01:57","modified_gmt":"2026-10-15T19:01:57","slug":"servicedegradation-ex1479349-exchange-online-users-may-be-unable-to-reply-or-reply-all-to-email-messages-sent-to-microsoft-365-groups-in-exchange-online-10","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-10-16-servicedegradation-ex1479349-exchange-online-users-may-be-unable-to-reply-or-reply-all-to-email-messages-sent-to-microsoft-365-groups-in-exchange-online-10","title":{"rendered":"[serviceDegradation] EX1479349 | Exchange Online | Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online"},"content":{"rendered":"
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EX1479349 | Exchange Online | Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceDegradation<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online.<\/td>\n<\/tr>\n
Last Updated<\/th>\n10\/15\/2026 18:50:22<\/td>\n<\/tr>\n
Start Time<\/th>\n09\/08\/2026 23:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online <\/p>\n

User impact: Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. <\/p>\n

More info: As a temporary alternative, impacted users may reply or reply all to email messages through user inboxes. <\/p>\n

Current status: Our fix remains at 93 percent, as the remaining saturation is expected to take extra time, per process. We’re continuing to monitor progress toward completion and confirm that impact is remediated for all users. <\/p>\n

Scope of impact: This issue impacts any user attempting to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. This information may be updated as our investigation continues. <\/p>\n

Start time: Tuesday, September 8, 2026, at 11:00 PM UTC <\/p>\n

Root cause: A recent change made to the service removed an attribute component from the service process that requires that attribute, leading to impact. <\/p>\n

Next update by: Monday, October 19, 2026, at 8:30 PM UTC<\/td>\n<\/tr>\n

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\u958b\u59cb\u6642\u9593:2026\u5e749\u67088\u65e5\u706b\u66dc\u65e5 23:00 UTC <\/p>\n

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