{"id":15860,"date":"2026-04-10T19:00:54","date_gmt":"2026-04-10T10:00:54","guid":{"rendered":"https:\/\/m365jp.net\/?p=15860"},"modified":"2026-04-10T19:01:12","modified_gmt":"2026-04-10T10:01:12","slug":"servicedegradation-ex1254044-exchange-online-some-users-may-be-unable-to-use-classic-outlook-when-the-teams-meeting-add-in-is-enabled-8","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-10-servicedegradation-ex1254044-exchange-online-some-users-may-be-unable-to-use-classic-outlook-when-the-teams-meeting-add-in-is-enabled-8","title":{"rendered":"[serviceDegradation] EX1254044 | Exchange Online | Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled"},"content":{"rendered":"
\n
\n
\n\n\n\n
EX1254044 | Exchange Online | Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled<\/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>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may be unable to use classic Outlook when the Teams Meeting Add-in is enabled.<\/td>\n<\/tr>\n
Last Updated<\/th>\n04\/10\/2026 09:55:58<\/td>\n<\/tr>\n
Start Time<\/th>\n03\/12\/2026 12:36:00<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled<\/p>\n

User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled.<\/p>\n

More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service.<\/p>\n

We’ve confirmed that the previous Microsoft Teams version 26032.208.4399.5 works successfully with classic Outlook. We recommend reaching out to your support representatives to request a temporary reversion if you’re affected by this event while we work to resolve this issue.<\/p>\n

Current status: We\u2019ve successfully deployed the fix across the affected environments. Users may need to restart the Teams app to ensure the updated Teams Meeting Add-in is applied. We\u2019re monitoring service health for an extended period of time, to confirm that impact has been fully resolved.<\/p>\n

Scope of impact: Some users that are attempting to use classic Outlook with the Microsoft Teams meeting add-in that’s in the Microsoft Teams version 26043.2016.4478.2773 enabled may be impacted. This information may be updated as our investigation continues.<\/p>\n

Start time: Thursday, March 12, 2026, at 12:36 PM UTC<\/p>\n

Root cause: A code issue within a recent Microsoft Teams meeting add-in update under Microsoft Teams version 26043.2016.4478.2773 is causing a compatibility issue with classic Outlook and resulting in functionality issues.<\/p>\n

Next update by: Monday, April 20, 2026, at 10:30 AM UTC<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306fTeams\u4f1a\u8b70\u30a2\u30c9\u30a4\u30f3\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u3001\u30af\u30e9\u30b7\u30c3\u30afOutlook\u3092\u4f7f\u3048\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:Teams\u306e\u4f1a\u8b70\u30a2\u30c9\u30a4\u30f3\u3092\u6709\u52b9\u306b\u3059\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u30af\u30e9\u30b7\u30c3\u30afOutlook\u3092\u4f7f\u3048\u306a\u304f\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30\u60c5\u5831:\u5177\u4f53\u7684\u306b\u306f\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30e6\u30fc\u30b6\u30fc\u306f\u3069\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u3082\u30af\u30e9\u30b7\u30c3\u30afOutlook\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u969b\u306b\u30af\u30e9\u30c3\u30b7\u30e5\u3092\u7d4c\u9a13\u3057\u305f\u308a\u3001\u30b5\u30fc\u30d3\u30b9\u3092\u8d77\u52d5\u3067\u304d\u306a\u304f\u306a\u3063\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u4ee5\u524d\u306eMicrosoft Teams\u30d0\u30fc\u30b8\u30e7\u30f326032.208.4399.5\u304c\u30af\u30e9\u30b7\u30c3\u30afOutlook\u3067\u6b63\u5e38\u306b\u52d5\u4f5c\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u306e\u5f71\u97ff\u3092\u53d7\u3051\u305f\u5834\u5408\u306f\u3001\u5bfe\u5fdc\u62c5\u5f53\u8005\u306b\u9023\u7d61\u3057\u3066\u4e00\u6642\u7684\u306a\u30ea\u30d0\u30fc\u30c8\u3092\u4f9d\u983c\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n

\u73fe\u72b6:\u5f71\u97ff\u3092\u53d7\u3051\u305f\u74b0\u5883\u5168\u4f53\u3067\u4fee\u6b63\u3092\u7121\u4e8b\u306b\u5c55\u958b\u3057\u307e\u3057\u305f\u3002\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u66f4\u65b0\u3055\u308c\u305fTeams\u4f1a\u8b70\u30a2\u30c9\u30a4\u30f3\u304c\u9069\u7528\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306bTeams\u30a2\u30d7\u30ea\u3092\u518d\u8d77\u52d5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u5f71\u97ff\u304c\u5b8c\u5168\u306b\u89e3\u6d88\u3055\u308c\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u3001\u9577\u671f\u9593\u306b\u308f\u305f\u308a\u30b5\u30fc\u30d3\u30b9\u306e\u5065\u5168\u6027\u3092\u76e3\u8996\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:Microsoft Teams \u30d0\u30fc\u30b8\u30e7\u30f326043.2016.4478.2773\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u308bMicrosoft Teams\u306e\u4f1a\u8b70\u30a2\u30c9\u30a4\u30f3\u3067\u30af\u30e9\u30b7\u30c3\u30afOutlook\u3092\u4f7f\u304a\u3046\u3068\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u306e\u4e00\u90e8\u306f\u5f71\u97ff\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u60c5\u5831\u306f\u8abf\u67fb\u304c\u9032\u3080\u306b\u3064\u308c\u3066\u66f4\u65b0\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u958b\u59cb\u6642\u9593:2026\u5e743\u670812\u65e5\u6728\u66dc\u65e5 12:36 PM UTC<\/p>\n

\u6839\u672c\u539f\u56e0:\u6700\u8fd1\u306eMicrosoft Teams Meeting\u306e\u30a2\u30c9\u30a4\u30f3\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8(Microsoft Teams\u30d0\u30fc\u30b8\u30e7\u30f326043.2016.4478.2773)\u5185\u3067\u30b3\u30fc\u30c9\u306e\u554f\u984c\u304c\u3001\u30af\u30e9\u30b7\u30c3\u30afOutlook\u3068\u306e\u4e92\u63db\u6027\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3057\u3001\u6a5f\u80fd\u306e\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u6b21\u56de\u66f4\u65b0:2026\u5e744\u670820\u65e5\u6708\u66dc\u65e5 \u5348\u524d10\u664230\u5206 UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX1254044 | Exchange Online | Some users may be unable to use classic Outlook when the Teams Meeting Add-in is […]<\/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-15860","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15860","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=15860"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15860\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=15860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=15860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=15860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}