March 3, 2026 09:42 CET
March 3, 2026 08:42 UTC
INVESTIGATING
The previously communicated fix deployed by Microsoft did not resolve the issue as expected. We have re‑escalated the matter to Microsoft, and remain in close contact with their engineering teams as they reassess the situation.
We understand the impact this may be causing and will share further updates as soon as additional information becomes available.February 26, 2026 14:10 CET
February 26, 2026 13:10 UTC
MONITORING
Microsoft have deployed a fix for the issue causing Add-ins to disappear. Affected customers will need to reinstall the Total Protection Add-in through the Control Panel.
If the Add-in appears as already installed, please uninstall it first and then reinstall it via the Control Panel.
We will continue to monitor the situation.February 24, 2026 18:56 CET
February 24, 2026 17:56 UTC
INVESTIGATING
We continue to work closely with Microsoft as we investigate the Deploy Issues with our Outlook Add‑ins. Our high‑priority support case remains active, and we are staying in constant communication to support their efforts. At this stage, we unfortunately cannot provide a solution yet, but we highly recommend utilizing the workaround shared below. We will share updates as soon as new information is available through our joint investigation.
February 18, 2026 15:42 CET
February 18, 2026 14:42 UTC
INVESTIGATING
As a workaround you can manually deploy the Outlook Add-ins in your Microsoft 365 Tenant.
Total Protection Outlook Add-in Workaround
https://support.hornetsecurity.com/hc/en-us/articles/21797951259537-Manual-installation-of-the-Outlook-add-in
AIRV Outlook Add-in Workaround
https://cp.hornetsecurity.com/manual/en/ai_recipient_validation/t_deploy_ai_recipient_validation_add_in_manually.html
We will provide further updates as soon as additional information becomes available.February 17, 2026 12:42 CET
February 17, 2026 11:42 UTC
INVESTIGATING
We are currently investigating reports of missing Microsoft Outlook Add‑ins.
We have opened a high priority support case to notify Microsoft of the issue.
At this time, Microsoft is actively working to determine the root cause. The issue affects certain tenants where Add‑ins fail to install or previously installed Add‑ins unexpectedly disappear. Other tenants remain unaffected.
We will provide further updates as soon as additional information becomes available.