{"id":15775,"date":"2026-04-06T20:01:11","date_gmt":"2026-04-06T11:01:11","guid":{"rendered":"https:\/\/m365jp.net\/?p=15775"},"modified":"2026-04-06T20:07:59","modified_gmt":"2026-04-06T11:07:59","slug":"servicedegradation-ex1254044-exchange-online-some-users-may-be-unable-to-use-classic-outlook-when-the-teams-meeting-add-in-is-enabled-7","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-06-servicedegradation-ex1254044-exchange-online-some-users-may-be-unable-to-use-classic-outlook-when-the-teams-meeting-add-in-is-enabled-7","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":"
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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\/06\/2026 10:12:00<\/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\u2019re continuing to deploy the fix across the affected environments. While some environments may have already received the fix, we expect the rollout to complete by Thursday, April 9, 2026. Once the fix reaches your environment, users may need to restart the Teams app to ensure the updated Teams Meeting Add-in is applied. We\u2019re closely monitoring deployment progress throughout the rollout.<\/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

Estimated time to resolve: Thursday, April 9, 2026<\/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: Friday, April 10, 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\u5f15\u304d\u7d9a\u304d\u5c55\u958b\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u90e8\u306e\u74b0\u5883\u3067\u306f\u3059\u3067\u306b\u4fee\u6b63\u304c\u5b8c\u4e86\u3057\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u30012026\u5e744\u67089\u65e5\u6728\u66dc\u65e5\u307e\u3067\u306b\u5c55\u958b\u5b8c\u4e86\u3059\u308b\u898b\u8fbc\u307f\u3067\u3059\u3002\u4fee\u6b63\u304c\u74b0\u5883\u306b\u5c4a\u304f\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306fTeams\u30a2\u30d7\u30ea\u3092\u518d\u8d77\u52d5\u3057\u3066\u6700\u65b0\u306eTeams\u4f1a\u8b70\u30a2\u30c9\u30a4\u30f3\u304c\u9069\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u5c55\u958b\u671f\u9593\u4e2d\u3001\u5c55\u958b\u306e\u9032\u6357\u3092\u7dbf\u5bc6\u306b\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

\u89e3\u6c7a\u307e\u3067\u306e\u63a8\u5b9a\u671f\u9593:2026\u5e744\u67089\u65e5(\u6728)<\/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\u670810\u65e5\u91d1\u66dc\u65e5 \u5348\u524d10\u664230\u5206 UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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