{"id":15524,"date":"2026-03-23T20:01:30","date_gmt":"2026-03-23T11:01:30","guid":{"rendered":"https:\/\/m365jp.net\/?p=15524"},"modified":"2026-03-23T20:06:23","modified_gmt":"2026-03-23T11:06:23","slug":"servicedegradation-ex1254044-exchange-online-some-users-may-be-unable-to-use-classic-outlook-when-the-teams-meeting-add-in-is-enabled-3","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-03-23-servicedegradation-ex1254044-exchange-online-some-users-may-be-unable-to-use-classic-outlook-when-the-teams-meeting-add-in-is-enabled-3","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>\nincident<\/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>\n03\/23\/2026 10:02:21<\/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. While we work on the permanent fix, we recommend impacted users upgrade to the latest Outlook version.<\/p>\n

A code issue within a recent Microsoft Teams Meeting Add-in update under version 26043.2016.4478.2773, is causing a compatibility issue with classic Outlook, and resulting in functionality issues. We’ve confirmed that the previous Microsoft Teams version 26032.208.4399.5 works successfully with classic Outlook, though we recommend affected users that are on the latest updated Microsoft Teams version to also upgrade to the latest Outlook version to avoid further complications.<\/p>\n

Current status: We’ve determined that the aforementioned fix isn’t a viable option due to impact occurring due to outdated versions causing the incompatibility and recommend if you’re affected by this event that you update to the latest Classic OutlookWin32 version. However, please reach out to your support representatives to request a temporary reversion if you require additional time to upgrade your Outlook version.<\/p>\n

Scope of impact: Some users that are attempting to use classic Outlook with the Microsoft Teams Meeting Add-in 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 version 26043.2016.4478.2773 is causing a compatibility issue with classic Outlook and resulting in functionality issues.<\/p>\n

Next update by: Monday, March 30, 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

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\u73fe\u72b6:\u524d\u8ff0\u306e\u4fee\u6b63\u306f\u3001\u4e92\u63db\u6027\u306e\u539f\u56e0\u3067\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u539f\u56e0\u3067\u5f71\u97ff\u304c\u51fa\u308b\u305f\u3081\u3001\u6709\u52b9\u306a\u9078\u629e\u80a2\u3067\u306f\u306a\u3044\u3068\u5224\u65ad\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b\u5834\u5408\u306f\u3001\u6700\u65b0\u306eClassic OutlookWin32\u30d0\u30fc\u30b8\u30e7\u30f3\u3078\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u63a8\u5968\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001Outlook\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u306b\u8ffd\u52a0\u6642\u9593\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u30b5\u30dd\u30fc\u30c8\u62c5\u5f53\u8005\u306b\u9023\u7d61\u3057\u3066\u4e00\u6642\u7684\u306a\u5fa9\u6d3b\u3092\u4f9d\u983c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

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

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\u6b21\u56de\u66f4\u65b0:2026\u5e743\u670830\u65e5(\u6708)\u5348\u524d10\u664230\u5206(UTC)<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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