Outlook Add‑ins Missing

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.

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.

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.

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.

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.

We are continuing to work with Microsoft through multiple escalation channels regarding the issue affecting Outlook Add-ins. Microsoft’s engineering teams are actively investigating the root cause and working on a resolution. We understand the impact this may have and will provide further updates as soon as additional information becomes available, thank you for your patience thus far.
While we work on resolving the issue, we encourage you to use the recommended workarounds shared below. Be sure to execute each step to successfully deploy the Add‑in manually.