{"id":18240,"date":"2026-09-02T00:01:41","date_gmt":"2026-09-01T15:01:41","guid":{"rendered":"https:\/\/m365jp.net\/?p=18240"},"modified":"2026-09-02T00:06:40","modified_gmt":"2026-09-01T15:06:40","slug":"servicedegradation-ex1464935-exchange-online-users-may-be-unable-to-connect-to-or-experience-degraded-functionality-with-exchange-online-12","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-09-02-servicedegradation-ex1464935-exchange-online-users-may-be-unable-to-connect-to-or-experience-degraded-functionality-with-exchange-online-12","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 14:46:14<\/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
– Delays or failures when sending or receiving email messages via Outlook for iOS and Android.<\/p>\n

Current status: We’re continuing to apply the targeted remediation across the remaining affected infrastructure where needed. Service telemetry continues to show positive recovery trends, with availability improving across previously impacted scenarios. We’re actively validating that authentication, connectivity, and search experiences are returning to expected service levels, while maintaining enhanced monitoring to ensure improvements are sustained and any residual impact is addressed.<\/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

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 4:00 PM 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

\u5229\u7528\u8005\u306f\u3053\u306e\u51fa\u6765\u4e8b\u306b\u95a2\u9023\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u75c7\u72b6\u3092\u7d4c\u9a13\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4ee5\u4e0b\u306b\u9650\u5b9a\u3055\u308c\u307e\u305b\u3093\u3002
– 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
– Exchange Online\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u6642\u306e\u8a8d\u8a3c\u95a2\u9023\u30a8\u30e9\u30fc\u3002
– \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
– Outlook(iOS\u304a\u3088\u3073Android)\u3067\u306e\u30e1\u30fc\u30eb\u9001\u53d7\u4fe1\u306e\u9045\u5ef6\u3084\u5931\u6557\u3002<\/p>\n

\u73fe\u72b6:\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30a4\u30f3\u30d5\u30e9\u5168\u4f53\u3067\u30bf\u30fc\u30b2\u30c3\u30c8\u3092\u7d5e\u3063\u305f\u4fee\u5fa9\u63aa\u7f6e\u3092\u7d99\u7d9a\u3057\u3066\u3044\u307e\u3059\u3002\u30b5\u30fc\u30d3\u30b9\u30c6\u30ec\u30e1\u30c8\u30ea\u306f\u56de\u5fa9\u50be\u5411\u304c\u826f\u597d\u3067\u3001\u4ee5\u524d\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u305f\u30b7\u30ca\u30ea\u30aa\u3067\u3082\u5229\u7528\u53ef\u80fd\u6027\u304c\u5411\u4e0a\u3057\u3066\u3044\u307e\u3059\u3002\u8a8d\u8a3c\u3001\u63a5\u7d9a\u6027\u3001\u691c\u7d22\u4f53\u9a13\u304c\u671f\u5f85\u3055\u308c\u308b\u30b5\u30fc\u30d3\u30b9\u30ec\u30d9\u30eb\u306b\u623b\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u7a4d\u6975\u7684\u306b\u691c\u8a3c\u3057\u3064\u3064\u3001\u6539\u5584\u304c\u6301\u7d9a\u3057\u6b8b\u7559\u5f71\u97ff\u304c\u5bfe\u51e6\u3055\u308c\u308b\u3088\u3046\u76e3\u8996\u3092\u5f37\u5316\u3057\u3066\u3044\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

\u6839\u672c\u539f\u56e0:\u8907\u6570\u306eMicrosoft 365\u30b5\u30fc\u30d3\u30b9\u3067\u4f7f\u7528\u3055\u308c\u308b\u30b3\u30a2\u8a8d\u8a3c\u8a2d\u5b9a\u306e\u554f\u984c\u304c\u5f71\u97ff\u3092\u5f15\u304d\u8d77\u3053\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u6b21\u56de\u66f4\u65b0:2026\u5e749\u67081\u65e5\u706b\u66dc\u65e5 \u5348\u5f8c4:00 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-18240","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18240","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=18240"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18240\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=18240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=18240"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=18240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}