{"id":18741,"date":"2026-09-26T09:01:56","date_gmt":"2026-09-26T00:01:56","guid":{"rendered":"https:\/\/m365jp.net\/?p=18741"},"modified":"2026-09-26T09:05:22","modified_gmt":"2026-09-26T00:05:22","slug":"servicedegradation-ex1478163-exchange-online-users-may-be-unable-to-update-calendar-delegates-in-the-classic-outlook-desktop-client-4","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-4","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 23:54:56<\/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\u2019re in the testing and validation stages of our fix deployment procedures and we anticipate that these actions will be completed, as well as the subsequent deployment process prior to our next scheduled update. At which point, we aim to provide a remediation timeline. <\/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: Monday, September 28, 2026, at 10:00 PM UTC<\/td>\n<\/tr>\n

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\u6b21\u56de\u66f4\u65b0:2026\u5e749\u670828\u65e5\u6708\u66dc\u65e5 22:00 UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

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