{"id":13963,"date":"2025-11-22T10:01:08","date_gmt":"2025-11-22T01:01:08","guid":{"rendered":"https:\/\/m365jp.net\/?p=13963"},"modified":"2025-11-22T10:06:44","modified_gmt":"2025-11-22T01:06:44","slug":"servicedegradation-ex1188132-exchange-online-some-users-may-be-intermittently-unable-to-access-their-exchange-online-mailboxes-using-any-connection-method-8","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2025-11-22-servicedegradation-ex1188132-exchange-online-some-users-may-be-intermittently-unable-to-access-their-exchange-online-mailboxes-using-any-connection-method-8","title":{"rendered":"[serviceDegradation] EX1188132 | Exchange Online | Some users may be intermittently unable to access their Exchange Online mailboxes using any connection method"},"content":{"rendered":"
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EX1188132 | Exchange Online | Some users may be intermittently unable to access their Exchange Online mailboxes using any connection method<\/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>\nincident<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may be intermittently unable to access their Exchange Online mailboxes using any connection method.<\/td>\n<\/tr>\n
Last Updated<\/th>\n11\/22\/2025 00:38:56<\/td>\n<\/tr>\n
Start Time<\/th>\n11\/20\/2025 13:25:00<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users may be intermittently unable to access their Exchange Online mailboxes using any connection method<\/p>\n

User impact: Users may be intermittently unable to access their Exchange Online mailboxes using any connection method.<\/p>\n

Current status: From our analysis into the service health telemetry errors and reports of impact from a subset of users, we suspect there may be a code issue within the affected service infrastructure that\u2019s contributing to the persistent impact. We\u2019re investigating further into this potential code issue to pinpoint what\u2019s causing the behavior and to identify a solution that addresses the remaining impact.<\/p>\n

Scope of impact: This issue appears to be intermittently impacting a small subset of users, though potentially any user accessing Exchange Online may be intermittently affected.<\/p>\n

Root cause: An indexing issue within a section of mailbox database infrastructure responsible for providing access to Exchange Online mailboxes caused mailbox state invalidations and client disconnections, resulting in impact.<\/p>\n

Next update by: Monday, November 24, 2025, at 9:30 PM UTC<\/td>\n<\/tr>\n

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