Some users may have been unable to use classic Outlook when the Teams Meeting Add-in was enabled

Title: Some users may have been unable to use classic Outlook when the Teams Meeting Add-in was enabled User impact: Users may have been unable to use classic Outlook when the Teams Meeting Add-in was enabled. More info: Specifically, impacted users may have experienced crashes while using the classic Outlook on any client, or been unable to launch the service. We've confirmed that the previous Microsoft Teams version 26032.208.4399.5 worked successfully with classic Outlook. Users who updated to the latest version of Teams and were still experiencing issues could've restarted the Teams app and signed out and back in again to ensure the updated configuration was applied. If the issue persisted, we recommended reaching out to your support representatives to request a temporary reversion if were affected by this event. Final status: We've confirmed that the fix has been successfully deployed and impact remediated. Scope of impact: Some users attempting to use classic Outlook with the Microsoft Teams Meeting Add-in enabled in Teams version 26043.2016.4478.2773 may have been impacted. Start time: Wednesday, February 25, 2026, at 1:10 AM UTC End time: Wednesday, May 06, 2026, at 7:03 AM UTC Root cause: A code issue within a recent Microsoft Teams Meeting Add-in update under Microsoft Teams version 26043.2016.4478.2773 was causing a compatibility issue with classic Outlook and resulting in functionality issues. Next steps: We're reviewing our update procedures to better identify similar issues during our development and testing cycles. This the final update for the event.

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. We've confirmed that the previous Microsoft Teams version 26032.208.4399.5 works successfully with classic Outlook. Users who’ve updated to the latest version of Teams and are still experiencing issues should restart the Teams app and sign out and back in again to ensure the updated configuration is applied. If the issue persists, 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. Current status: We've confirmed that the fix is deploying as expected and we anticipate its completion by our next scheduled update. Scope of impact: Some users attempting to use classic Outlook with the Microsoft Teams Meeting Add-in enabled in Teams version 26043.2016.4478.2773 may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, February 25, 2026, at 1:10 AM UTC 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. Next update by: Thursday, May 07, 2026, at 11:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. We've confirmed that the previous Microsoft Teams version 26032.208.4399.5 works successfully with classic Outlook. Users who’ve updated to the latest version of Teams and are still experiencing issues should restart the Teams app and sign out and back in again to ensure the updated configuration is applied. If the issue persists, 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. Current status: We've experienced an unexpected delay to deploying the fix and will provide an update once the deployment is completed. Scope of impact: Some users attempting to use classic Outlook with the Microsoft Teams Meeting Add-in enabled in Teams version 26043.2016.4478.2773 may be impacted. This information may be updated as our investigation continues. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Tuesday, May 5, 2026, at 11:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. We've confirmed that the previous Microsoft Teams version 26032.208.4399.5 works successfully with classic Outlook. Users who’ve updated to the latest version of Teams and are still experiencing issues should restart the Teams app and sign out and back in again to ensure the updated configuration is applied. If the issue persists, 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. Current status: We've determined that a fix is ready for deployment and is expected to be completed by tomorrow. We're continuing to monitor the fix progress and will provide an update once the deployment is completed. Scope of impact: Some users attempting to use classic Outlook with the Microsoft Teams Meeting Add-in enabled in Teams version 26043.2016.4478.2773 may be impacted. This information may be updated as our investigation continues. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Tuesday, April 28, 2026, at 11:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. We've confirmed that the previous Microsoft Teams version 26032.208.4399.5 works successfully with classic Outlook. Users who’ve updated to the latest version of Teams and are still experiencing issues should restart the Teams app and sign out and back in again to ensure the updated configuration is applied. If the issue persists, 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. Current status: We’ve confirmed that the fix continues to be deployed as expected and should complete by Tuesday, April 28. After this, we’ll begin removing the temporary version restrictions placed on some users. In the meantime, affected users can follow the steps in the More Info section above to temporarily bypass the impact while we deploy our solution. Scope of impact: Some users attempting to use classic Outlook with the Microsoft Teams Meeting Add-in enabled in Teams version 26043.2016.4478.2773 may be impacted. This information may be updated as our investigation continues. Start time: Thursday, March 12, 2026, at 12:36 PM UTC Estimated time to resolve: Tuesday, April 28, 2026 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. Next update by: Monday, April 27, 2026, at 11:00 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. We've confirmed that the previous Microsoft Teams version 26032.208.4399.5 works successfully with classic Outlook. Users who’ve updated to the latest version of Teams and are still experiencing issues should restart the Teams app and sign out and back in again to ensure the updated configuration is applied. If the issue persists, 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. Current status: We’ve reassessed our deployment timeline and we now expect to complete deployment of the fix by Tuesday, April 28. After this, we’ll begin removing the temporary version restrictions placed on some users. In the meantime, affected users can follow the steps in the More Info section above to temporarily bypass the impact while we deploy our solution. Scope of impact: Some users attempting to use classic Outlook with the Microsoft Teams Meeting Add-in enabled in Teams version 26043.2016.4478.2773 may be impacted. This information may be updated as our investigation continues. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Friday, April 24, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. 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. Current status: We’re deploying a fix for the additional issue affecting newer Teams builds. Some users will temporarily remain on a previous Teams version as a preventative measure to avoid further disruption while the fix is released as part of an upcoming Teams update. Based on our timeline, deployment of the fix is expected to complete by approximately May 7, 2026. After this, we’ll begin removing the temporary version restrictions placed on some users. In the meantime, users who’ve updated to the latest version of Teams and are still experiencing issues should restart the Teams app and sign out and back in again to ensure the updated configuration is applied. If the issue persists, admins should contact support to enable the temporary mitigation while the fix is being deployed. We'll continue to monitor the deployment to ensure that is proceeds as expected. Scope of impact: Some users attempting to use classic Outlook with the Microsoft Teams Meeting Add-in enabled in Teams version 26043.2016.4478.2773 may be impacted. This information may be updated as our investigation continues. Start time: Thursday, March 12, 2026, at 12:36 PM UTC Estimated time to resolve: Thursday, May 7, 2026 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. Next update by: Tuesday, April 28, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. 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. Current status: We’ve completed deployment of the fix for the original issue, and users on updated Teams versions should no longer be impacted. However, some users will temporarily remain on a previous Teams version while we address a separate, newly identified issue affecting the newer version. This is a preventative measure to avoid further disruption. We’re working on a fix for this issue and expect to share a deployment timeline by our next scheduled update. 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. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Tuesday, April 21, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. 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. Current status: We’ve 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’re monitoring service health for an extended period of time, to confirm that impact has been fully resolved. 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. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Monday, April 20, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. 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. Current status: We’re 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’re closely monitoring deployment progress throughout the rollout. 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. Start time: Thursday, March 12, 2026, at 12:36 PM UTC Estimated time to resolve: Thursday, April 9, 2026 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. Next update by: Friday, April 10, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. 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. Current status: We're deploying the aforementioned fix and anticipate completion by our next scheduled update time. 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. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Monday, April 6, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. More info: Specifically, impacted users may experience crashes while using the classic Outlook on any client, or be unable to launch the service. 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. Current status: We've developed a fix to correct the issue with the Microsoft Teams meeting add-in that'll be included in Microsoft Teams version 26058.712.4527.9297, which will begin deployment on March 30, 2026. While we work on deploying this fix, we've confirmed that the previous Microsoft Teams version 26032.208.4399.5 works successfully with classic Outlook and recommend reaching out to their support representatives to request a temporary reversion to the older Microsoft Teams version if they're affected by this event. 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. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Monday, March 30, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. 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. 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. 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. 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. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Monday, March 30, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. 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. 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. Current status: We're continuing to work on deploying a fix to resolve the compatibility issue, and anticipate that this should be complete by our next scheduled update. 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. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Monday, March 23, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. 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. Current status: We've identified a code issue within a recent Microsoft Teams Meeting Add-in update under version 26043.2016.4478.2773, which 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. We're working on deploying a fix to resolve the compatibility issue, and we anticipate being able to provide a remediation timeline by our next scheduled update. 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. Start time: Thursday, March 12, 2026, at 12:36 PM UTC 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. Next update by: Thursday, March 19, 2026, at 10:30 AM UTC

Title: Some users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled User impact: Users may be unable to use classic Outlook when the Teams Meeting Add-in is enabled. 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. As a workaround, users can also perform an Online Repair of Office or update Outlook to the latest version to resolve the issue. Current status: We're analyzing support provided information to determine our next troubleshooting steps. 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. Next update by: Tuesday, March 17, 2026, at 9:00 AM UTC