{"id":15559,"date":"2026-03-25T02:01:02","date_gmt":"2026-03-24T17:01:02","guid":{"rendered":"https:\/\/m365jp.net\/?p=15559"},"modified":"2026-03-25T02:02:20","modified_gmt":"2026-03-24T17:02:20","slug":"servicedegradation-ex1256020-exchange-online-some-users-may-be-intermittently-unable-to-access-their-exchange-online-mailboxes-in-some-connection-methods-7","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-03-25-servicedegradation-ex1256020-exchange-online-some-users-may-be-intermittently-unable-to-access-their-exchange-online-mailboxes-in-some-connection-methods-7","title":{"rendered":"[serviceDegradation] EX1256020 | Exchange Online | Some users may be intermittently unable to access their Exchange Online mailboxes in some connection methods"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">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<hr>\n<table id=\"data\">\n<tbody>\n<tr>\n<th>Status<\/th>\n<td class=\"bad\">serviceDegradation<\/td>\n<\/tr>\n<tr>\n<th>Classification<\/th>\n<td>incident<\/td>\n<\/tr>\n<tr>\n<th>User Impact<\/th>\n<td>Users may be intermittently unable to access their Exchange Online mailboxes in some connection methods.<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>03\/24\/2026 16:54:43<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>03\/12\/2026 00:00:00<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td><\/td>\n<\/tr>\n<tr>\n<th>Latest Message<\/th>\n<td>Title: Some users may be intermittently unable to access their Exchange Online mailboxes in some connection methods<\/p>\n<p>  User impact: Users may be intermittently unable to access their Exchange Online mailboxes in some connection methods.<\/p>\n<p>  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<p>  Current status: While error trends continue to reduce, we suspect additional actions may be necessary to fully remediate impact. We&#8217;ve identified two additional actions to assist with expediting impact resolution. Firstly, we&#8217;re disabling the impacting change   more broadly than initially, given we&#8217;ve seen no adverse effects for the subset of users that it&#8217;s been disabled for already. Secondly, we&#8217;ve identified another change which was enabled as a pre-requisite for enabling the impacting change. We&#8217;re working to   disable this change to assist with remediation. We expect to have more insight into timelines for completing these actions and impact resolution with our next scheduled communication update.<\/p>\n<p>  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.<\/p>\n<p>  Start time: Thursday, March 12, 2026, at 12:00 AM UTC<\/p>\n<p>  Root cause: A recent change within the Exchange Online service intended to introduce a new virtual account resulted in impact.<\/p>\n<p>  Next update by: Wednesday, March 25, 2026, at 6:30 PM UTC<\/td>\n<\/tr>\n<tr>\n<th>Machine Translation<\/th>\n<td>\u30bf\u30a4\u30c8\u30eb:\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u3042\u308b\u63a5\u7d9a\u65b9\u6cd5\u3067\u65ad\u7d9a\u7684\u306bExchange Online\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n<p>  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Online | Some users may be intermittently unable to access their Exchange Online mailboxe 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