{"id":18277,"date":"2026-09-02T11:01:46","date_gmt":"2026-09-02T02:01:46","guid":{"rendered":"https:\/\/m365jp.net\/?p=18277"},"modified":"2026-09-02T11:05:10","modified_gmt":"2026-09-02T02:05:10","slug":"servicedegradation-ex1464935-exchange-online-users-may-be-unable-to-connect-to-or-experience-degraded-functionality-with-exchange-online-15","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-15","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\/02\/2026 01:30:32<\/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 closely monitor service health as we carefully expand our reiterative corrective actions across additional regions. This work involves re-deploying our targeted fixes to the dependent authentication components to ensure service resilience, while balancing ongoing traffic patterns to avoid additional residual impact. Most users should see recovery across the majority of impacted scenarios, though some scenarios, including those reliant on Graph API and Representational State Transfer (REST) connection methods, will remain degraded until our mitigation efforts are complete. <\/p>\n

Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. <\/p>\n

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

Next update by: Wednesday, September 2, 2026, at 3:30 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

\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:\u30b5\u30fc\u30d3\u30b9\u5065\u5168\u6027\u3092\u5f15\u304d\u7d9a\u304d\u7dbf\u5bc6\u306b\u76e3\u8996\u3057\u3001\u8ffd\u52a0\u306e\u5730\u57df\u3067\u7e70\u308a\u8fd4\u3057\u306e\u662f\u6b63\u63aa\u7f6e\u3092\u614e\u91cd\u306b\u62e1\u5927\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u4f5c\u696d\u3067\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u306e\u30ec\u30b8\u30ea\u30a8\u30f3\u30b9\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u30bf\u30fc\u30b2\u30c3\u30c8\u4fee\u6b63\u3092\u4f9d\u5b58\u8a8d\u8a3c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u518d\u5c55\u958b\u3057\u3064\u3064\u3001\u7d99\u7d9a\u7684\u306a\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u30d1\u30bf\u30fc\u30f3\u3092\u8abf\u6574\u3057\u3066\u4f59\u5206\u306a\u5f71\u97ff\u3092\u56de\u907f\u3059\u308b\u4f5c\u696d\u3092\u542b\u307f\u307e\u3059\u3002\u307b\u3068\u3093\u3069\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30b7\u30ca\u30ea\u30aa\u306e\u5927\u90e8\u5206\u3067\u56de\u5fa9\u304c\u898b\u3089\u308c\u308b\u306f\u305a\u3067\u3059\u304c\u3001Graph API\u3084Representational State Transfer(REST)\u63a5\u7d9a\u65b9\u5f0f\u306b\u4f9d\u5b58\u3059\u308b\u30b7\u30ca\u30ea\u30aa\u306f\u3001\u7de9\u548c\u63aa\u7f6e\u304c\u5b8c\u4e86\u3059\u308b\u307e\u3067\u52a3\u5316\u3057\u305f\u307e\u307e\u3067\u3059\u3002 <\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u4e0a\u8a18\u306e\u5f71\u97ff\u30b7\u30ca\u30ea\u30aa\u306e\u3044\u305a\u308c\u304b\u3092\u5b9f\u884c\u3057\u3088\u3046\u3068\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002 <\/p>\n

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

\u6b21\u56de\u66f4\u65b0:2026\u5e749\u67082\u65e5\u6c34\u66dc\u65e5 \u5348\u524d3\u664230\u5206 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-18277","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18277","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=18277"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18277\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=18277"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=18277"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=18277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}