{"id":13406,"date":"2025-10-21T06:01:09","date_gmt":"2025-10-20T21:01:09","guid":{"rendered":"https:\/\/m365jp.net\/?p=13406"},"modified":"2025-10-21T06:05:33","modified_gmt":"2025-10-20T21:05:33","slug":"servicerestored-ex1173600-exchange-online-some-users-may-have-the-new-outlook-client-open-in-their-web-browser-instead-of-the-desktop-client","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2025-10-21-servicerestored-ex1173600-exchange-online-some-users-may-have-the-new-outlook-client-open-in-their-web-browser-instead-of-the-desktop-client","title":{"rendered":"[serviceRestored] EX1173600 | Exchange Online | Some users may have the new Outlook client open in their web browser instead of the Desktop client"},"content":{"rendered":"
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EX1173600 | Exchange Online | Some users may have the new Outlook client open in their web browser instead of the Desktop client<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceRestored<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers had the new Outlook client open in their web browser instead of the Desktop client.<\/td>\n<\/tr>\n
Last Updated<\/th>\n10\/20\/2025 20:22:23<\/td>\n<\/tr>\n
Start Time<\/th>\n10\/14\/2025 03:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n10\/17\/2025 16:00:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users may have the new Outlook client open in their web browser instead of the Desktop client<\/p>\n

User impact: Users had the new Outlook client open in their web browser instead of the Desktop client.<\/p>\n

More info: As a workaround, users were able to use the classic Outlook to access their Exchange Online mailbox.<\/p>\n

Final status: Our fix deployment is complete, and we\u2019ve confirmed from service telemetry that this issue is resolved. Affected users may need to restart Outlook, potentially more than one time, to pick up the fix.<\/p>\n

Scope of impact: Your organization was affected by this event, and some users attempting to open the new Outlook client were impacted.<\/p>\n

Start time: Tuesday, October 14, 2025, at 3:00 AM UTC<\/p>\n

End time: Friday, October 17, 2025, at 4:00 PM UTC<\/p>\n

Root cause: A code issue contained in a recent service update was causing a race condition and resulting in the impact.<\/p>\n

Next steps:
– We\u2019re continuing our investigation to determine exactly how the offending code bug was introduced to better detect and prevent issues like this from occurring in the future.<\/p>\n

This is the final update for the event.<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb: \u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u30c7\u30b9\u30af\u30c8\u30c3\u30d7 \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u306f\u306a\u304f Web \u30d6\u30e9\u30a6\u30b6\u30fc\u3067\u65b0\u3057\u3044 Outlook \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u958b\u3044\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff: \u30e6\u30fc\u30b6\u30fc\u306f\u3001\u30c7\u30b9\u30af\u30c8\u30c3\u30d7 \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u306f\u306a\u304f Web \u30d6\u30e9\u30a6\u30b6\u30fc\u3067\u65b0\u3057\u3044 Outlook \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u958b\u3044\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n

\u8a73\u7d30: \u56de\u907f\u7b56\u3068\u3057\u3066\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u5f93\u6765\u306e Outlook \u3092\u4f7f\u7528\u3057\u3066 Exchange Online \u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n

\u6700\u7d42\u72b6\u614b: \u4fee\u6b63\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30c7\u30d7\u30ed\u30a4\u304c\u5b8c\u4e86\u3057\u3001\u30b5\u30fc\u30d3\u30b9 \u30c6\u30ec\u30e1\u30c8\u30ea\u304b\u3089\u3053\u306e\u554f\u984c\u304c\u89e3\u6c7a\u3055\u308c\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002\u5f71\u97ff\u3092\u53d7\u3051\u308b\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u4fee\u6b63\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u3001Outlook \u3092\u8907\u6570\u56de\u518d\u8d77\u52d5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u5f71\u97ff\u306e\u7bc4\u56f2: \u7d44\u7e54\u304c\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u306e\u5f71\u97ff\u3092\u53d7\u3051\u3001\u65b0\u3057\u3044 Outlook \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u958b\u3053\u3046\u3068\u3057\u305f\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u5f71\u97ff\u3092\u53d7\u3051\u307e\u3057\u305f\u3002<\/p>\n

\u958b\u59cb\u6642\u9593: 14 \u5e74 2025 \u6708 3 \u65e5\u706b\u66dc\u65e5\u5348\u524d 00 \u6642 UTC<\/p>\n

\u7d42\u4e86\u6642\u523b: 17 \u5e74 2025 \u6708 4 \u65e5\u91d1\u66dc\u65e5\u5348\u5f8c 00 \u6642 UTC<\/p>\n

\u6839\u672c\u539f\u56e0: \u6700\u8fd1\u306e\u30b5\u30fc\u30d3\u30b9\u66f4\u65b0\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u542b\u307e\u308c\u308b\u30b3\u30fc\u30c9\u306e\u554f\u984c\u306b\u3088\u308a\u3001\u7af6\u5408\u72b6\u614b\u304c\u767a\u751f\u3057\u3001\u5f71\u97ff\u304c\u767a\u751f\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
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\u30a4\u30d9\u30f3\u30c8\u306e\u6700\u7d42\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX1173600 | Exchange Online | Some users may have the new Outlook client open in their web browser instead of […]<\/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-13406","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/13406","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=13406"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/13406\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=13406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=13406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=13406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}