Blocking of Classic Teams Has Begun – Prepare for Completion

Blocking of Classic Teams has started as of July 1, 2025, and will continue over the next few weeks. Users must migrate to New Teams to avoid disruption. Scripts are available to identify devices running Classic Teams and to uninstall it. Further guidance can be found in the official documentation.

You are receiving this message because users in your tenant are still using Classic Teams. As of July 1, 2025, we have begun blocking access to Classic Teams. This rollout will continue over the next few weeks until all users are fully blocked. To avoid disruption and ensure business continuity, we strongly recommend completing your migration to New Teams as soon as possible. If your organization has already completed the migration, no further action is required. 

• You can find the Windows devices that are still running classic Teams by running this script.
• You can uninstall Classic Teams using this script.

[How this will affect your organization:]

Starting July 1, 2025, users in your organization will begin losing access to Classic Teams as Microsoft rolls out the blocking process. This rollout will occur over several weeks, and users will be unable to use Classic Teams once blocked. To prevent any disruption to business operations, please ensure all users transition to the New Teams desktop app or access Teams via the web at https://teams.microsoft.com. 

For detailed guidance, refer to the official documentation: Teams Classic End of Availability. 

[What you need to do to prepare:]

• Use this script to find Windows devices that need to be upgraded to new Teams. While the main purpose of the script is to identify issues before installation of new Teams, it can also be used to detect devices running unsupported OS for new Teams Installation.
• Upgrade users as soon as possible to the new Teams app. Learn more about switching to new Teams. Prerequisites for new Teams installation: Windows and Mac
• If you have already migrated all your users to New Teams and want to uninstall Classic Teams, use this script.

Learn more

• Pre-installation script for new Teams client - Microsoft Teams | Microsoft Learn
• The Prerequisites for target computers section of Bulk deploy the new Microsoft Teams desktop client - Microsoft Teams | Microsoft Learn
• Script to uninstall or Script for uninstalling