{"id":18727,"date":"2026-09-26T06:01:49","date_gmt":"2026-09-25T21:01:49","guid":{"rendered":"https:\/\/m365jp.net\/?p=18727"},"modified":"2026-09-26T06:05:09","modified_gmt":"2026-09-25T21:05:09","slug":"servicedegradation-ex1478163-exchange-online-users-may-be-unable-to-update-calendar-delegates-in-the-classic-outlook-desktop-client-3","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-09-26-servicedegradation-ex1478163-exchange-online-users-may-be-unable-to-update-calendar-delegates-in-the-classic-outlook-desktop-client-3","title":{"rendered":"[serviceDegradation] EX1478163 | Exchange Online | Users may be unable to update calendar delegates in the classic Outlook desktop client"},"content":{"rendered":"
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EX1478163 | Exchange Online | Users may be unable to update calendar delegates in the classic Outlook desktop client <\/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 update calendar delegates in the classic Outlook desktop client.<\/td>\n<\/tr>\n
Last Updated<\/th>\n09\/25\/2026 20:47:40<\/td>\n<\/tr>\n
Start Time<\/th>\n09\/24\/2026 05:45:38<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may be unable to update calendar delegates in the classic Outlook desktop client <\/p>\n

User impact: Users may be unable to update calendar delegates in the classic Outlook desktop client. <\/p>\n

More info: As a workaround, affected users can manage delegate changes through Outlook on the web. <\/p>\n

Current status: We’ve confirmed that reverting the responsible change is not a valid remediation pathway for this event and have instead developed a code fix to address the regression. We’ll provide an update remediation timeline once we start deploying this fix. <\/p>\n

Scope of impact: Impact is specific to users that are unable to update calendar delegates in the classic Outlook desktop client. <\/p>\n

Start time: Wednesday, September 23, 2026, at 7:13 AM UTC <\/p>\n

Root cause: A recent update to the service contained a regression, resulting in this impact. <\/p>\n

Next update by: Saturday, September 26, 2026, at 1:30 AM UTC<\/td>\n<\/tr>\n

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