{"id":18227,"date":"2026-09-01T10:01:16","date_gmt":"2026-09-01T01:01:16","guid":{"rendered":"https:\/\/m365jp.net\/?p=18227"},"modified":"2026-09-01T10:07:02","modified_gmt":"2026-09-01T01:07:02","slug":"servicedegradation-ex1464935-exchange-online-users-may-be-unable-to-connect-to-or-experience-degraded-functionality-with-exchange-online-9","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-09-01-servicedegradation-ex1464935-exchange-online-users-may-be-unable-to-connect-to-or-experience-degraded-functionality-with-exchange-online-9","title":{"rendered":"[serviceDegradation] EX1464935 | Exchange Online | Users may be unable to connect to, or experience degraded functionality with Exchange Online"},"content":{"rendered":"
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EX1464935 | Exchange Online | Users may be unable to connect to, or experience degraded functionality with Exchange Online<\/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 unable to connect to, or experience degraded functionality with Exchange Online.<\/td>\n<\/tr>\n
Last Updated<\/th>\n09\/01\/2026 00:35:24<\/td>\n<\/tr>\n
Start Time<\/th>\n08\/31\/2026 15:08:00<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may be unable to connect to, or experience degraded functionality with Exchange Online<\/p>\n

User impact: Users may be unable to connect to, or experience degraded functionality with Exchange Online.<\/p>\n

More info: We’ve confirmed that the authentication component issue impacts other services beyond Exchange Online. For more information regarding other impact scenarios, please see: MO1465074. <\/p>\n

We’ve opted to keep this post (EX1464935) open as Exchange Online remains the most predominantly impacted service.<\/p>\n

Users may experience a variety of symptoms related to this event, including but not limited to:
– Delays, failures, or incomplete results when searching for content within Exchange Online mailboxes.
– Delays or failures when sending or receiving email messages.
– Authentication-related errors when accessing Exchange Online services.
– Difficulties accessing or performing actions within Exchange administration experiences.
– Intermittent failures affecting mailbox operations and message delivery work<\/p>\n

Current status: We’re progressively restarting targeted sections of affected infrastructure to ensure the re-applied authentication components are effectively implemented across affected services. We expect this will aid the recovery of affected scenarios. Users should expect delayed delivery of backlogged messages and residual impact across downstream scenarios as these actions are continuing. We’ll provide an expected recovery time as soon as one becomes available to us.<\/p>\n

Scope of impact: This issue may impact users attempting to send or receive email messages through Exchange Online. We’re continuing our investigation to determine the full scope of affected scenarios and will provide additional information as it becomes available.<\/p>\n

Start time: Monday, August 31, 2026, at 3:08 PM UTC<\/p>\n

Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact.<\/p>\n

Next update by: Tuesday, September 1, 2026, at 1:00 AM UTC<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u30e6\u30fc\u30b6\u30fc\u304cExchange Online\u306b\u63a5\u7d9a\u3067\u304d\u306a\u304f\u306a\u3063\u305f\u308a\u3001\u6a5f\u80fd\u304c\u52a3\u5316\u3057\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u30e6\u30fc\u30b6\u30fc\u306fExchange Online\u306b\u63a5\u7d9a\u3067\u304d\u306a\u304f\u306a\u3063\u305f\u308a\u3001\u6a5f\u80fd\u306e\u4f4e\u4e0b\u3092\u611f\u3058\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30\u60c5\u5831:\u8a8d\u8a3c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u554f\u984c\u306fExchange Online\u4ee5\u5916\u306e\u30b5\u30fc\u30d3\u30b9\u306b\u3082\u5f71\u97ff\u304c\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u4ed6\u306e\u5f71\u97ff\u30b7\u30ca\u30ea\u30aa\u306b\u3064\u3044\u3066\u306f\u3001MO1465074\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002 <\/p>\n

Exchange Online\u304c\u6700\u3082\u5927\u304d\u306a\u5f71\u97ff\u3092\u53d7\u3051\u3066\u3044\u308b\u30b5\u30fc\u30d3\u30b9\u3067\u3042\u308b\u305f\u3081\u3001\u3053\u306e\u6295\u7a3f(EX1464935)\u306f\u958b\u3044\u305f\u307e\u307e\u306b\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n

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– Exchange Online\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u5185\u3067\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u691c\u7d22\u3059\u308b\u969b\u306e\u9045\u5ef6\u3001\u5931\u6557\u3001\u307e\u305f\u306f\u4e0d\u5b8c\u5168\u306a\u7d50\u679c\u3002
– \u30e1\u30fc\u30eb\u306e\u9001\u53d7\u4fe1\u306b\u304a\u3051\u308b\u9045\u5ef6\u3084\u5931\u6557\u3002
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– \u53d6\u5f15\u6240\u7ba1\u7406\u4f53\u9a13\u5185\u3067\u306e\u64cd\u4f5c\u3084\u30a2\u30af\u30bb\u30b9\u306e\u56f0\u96e3\u3002
– \u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u64cd\u4f5c\u3084\u30e1\u30c3\u30bb\u30fc\u30b8\u914d\u4fe1\u4f5c\u696d\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u65ad\u7d9a\u7684\u306a\u969c\u5bb3<\/p>\n

\u73fe\u72b6:\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30a4\u30f3\u30d5\u30e9\u306e\u5bfe\u8c61\u533a\u9593\u3092\u6bb5\u968e\u7684\u306b\u518d\u8d77\u52d5\u3057\u3001\u518d\u9069\u7528\u3055\u308c\u305f\u8a8d\u8a3c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30b5\u30fc\u30d3\u30b9\u5168\u4f53\u3067\u52b9\u679c\u7684\u306b\u5b9f\u88c5\u3055\u308c\u308b\u3088\u3046\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30b7\u30ca\u30ea\u30aa\u306e\u5fa9\u65e7\u304c\u4fc3\u9032\u3055\u308c\u308b\u3068\u671f\u5f85\u3057\u3066\u3044\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u9045\u5ef6\u3057\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u914d\u4fe1\u3084\u3001\u3053\u308c\u3089\u306e\u5bfe\u5fdc\u304c\u7d9a\u304f\u4e2d\u3067\u4e0b\u6d41\u30b7\u30ca\u30ea\u30aa\u306b\u6b8b\u7559\u5f71\u97ff\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u3092\u899a\u609f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u56de\u5fa9\u671f\u9593\u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308a\u6b21\u7b2c\u3001\u4e88\u60f3\u3055\u308c\u308b\u5fa9\u65e7\u671f\u9593\u3092\u304a\u4f1d\u3048\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u3053\u306e\u554f\u984c\u306fExchange Online\u3092\u901a\u3058\u3066\u30e1\u30fc\u30eb\u306e\u9001\u53d7\u4fe1\u3092\u8a66\u307f\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u3092\u53ca\u307c\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5f71\u97ff\u3092\u53d7\u3051\u308b\u30b7\u30ca\u30ea\u30aa\u306e\u5168\u5bb9\u3092\u8abf\u67fb\u3057\u3001\u8ffd\u52a0\u60c5\u5831\u304c\u660e\u3089\u304b\u306b\u306a\u308a\u6b21\u7b2c\u304a\u77e5\u3089\u305b\u3057\u307e\u3059\u3002<\/p>\n

\u958b\u59cb\u6642\u9593:2026\u5e748\u670831\u65e5(\u6708)\u5348\u5f8c3\u664208\u5206(UTC)<\/p>\n

\u4e88\u5099\u7684\u306a\u6839\u672c\u539f\u56e0:\u8907\u6570\u306eMicrosoft 365\u30b5\u30fc\u30d3\u30b9\u3067\u4f7f\u7528\u3055\u308c\u308b\u30b3\u30a2\u8a8d\u8a3c\u69cb\u6210\u306e\u554f\u984c\u304c\u5f71\u97ff\u3092\u53ca\u307c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u6b21\u56de\u66f4\u65b0:2026\u5e749\u67081\u65e5\u706b\u66dc\u65e5 \u5348\u524d1\u6642 UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX1464935 | Exchange Online | Users may be unable to connect to, or experience degraded functionality with Exc […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-18227","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18227","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/comments?post=18227"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18227\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=18227"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=18227"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=18227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}