{"id":15603,"date":"2026-03-27T03:01:11","date_gmt":"2026-03-26T18:01:11","guid":{"rendered":"https:\/\/m365jp.net\/?p=15603"},"modified":"2026-03-27T03:06:39","modified_gmt":"2026-03-26T18:06:39","slug":"servicedegradation-ex1256020-exchange-online-some-users-may-be-intermittently-unable-to-access-their-exchange-online-mailboxes-in-some-connection-methods-10","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-03-27-servicedegradation-ex1256020-exchange-online-some-users-may-be-intermittently-unable-to-access-their-exchange-online-mailboxes-in-some-connection-methods-10","title":{"rendered":"[serviceDegradation] EX1256020 | Exchange Online | Some users may be intermittently unable to access their Exchange Online mailboxes in some connection methods"},"content":{"rendered":"
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EX1256020 | Exchange Online | Some users may be intermittently unable to access their Exchange Online mailboxes in some connection methods<\/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 in some connection methods.<\/td>\n<\/tr>\n
Last Updated<\/th>\n03\/26\/2026 17:41:44<\/td>\n<\/tr>\n
Start Time<\/th>\n03\/12\/2026 00:00:00<\/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 in some connection methods<\/p>\n

User impact: Users may be intermittently unable to access their Exchange Online mailboxes in some connection methods.<\/p>\n

More info: This issue may intermittently impact some users who are attempting to access the Exchange Online service through the Outlook mobile apps or the new Outlook for Mac desktop client.<\/p>\n

Current status: We’re monitoring our service health telemetry to determine whether the failures reduce as our efforts to enable our secondary mitigation progress.<\/p>\n

Scope of impact: Impact may occur for some users intermittently and users may be unable to access their Exchange Online mailboxes with the Outlook mobile apps or the new Outlook for Mac desktop client.<\/p>\n

Start time: Thursday, March 12, 2026, at 12:00 AM UTC<\/p>\n

Root cause: A recent update intended to enable new Virtual Account functionality introduced a routing conflict that\u2019s preventing the Outlook mobile apps from syncing to the Exchange service as expected, leading to impact.<\/p>\n

Next update by: Friday, March 27, 2026, at 1:30 AM UTC<\/td>\n<\/tr>\n

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