• Blocking dangerous files: Teams automatically prevents the sending of files that often contain malware (e.g., executable programs or scripts).

• Checking links: Every shared link is immediately scanned for fraud or phishing pages. Dangerous links trigger a warning.

• Displaying error reports: Users can report incorrectly blocked files or links so the system can learn and improve.

2. Emergency function “ZAP”: Zero-Hour Auto-Purge

Messages that have already been sent and contain malicious links or files are automatically deleted retrospectively once Microsoft detects the threat.

3. Why this adjustment is necessary now:

AI is making fraud attacks increasingly realistic and scalable.

Companies can no longer rely solely on employee awareness – with “Secure-by-Default,” Microsoft provides built-in protection.

4. What you should do now:

• Check IT settings: Administrators should review the Teams security settings by January 12, 2026.

• Prepare employees: Users may notice warnings or blocked content; internal processes may need adjustments.

• Adapt processes: Some legitimate files or scripts may require secure alternative methods for sharing.

5. You can check details here: Learn more directly from Microsoft.

The information on Microsoft’s website is updated regularly. However, it is not always easy to navigate. That is why our experts are happy to provide the specific information that applies to your company in a personal conversation.

If you have questions about the Teams security update or need support, please contact us.

We will be happy to help you.