Known issue in Outlook for Mac - Disabled injection based plugins

Update on May 7th 2020: As the world responds to the outbreak of COVID-19, our thoughts are with the people affected and the medical professionals working around the clock to help those most in need. In order to better serve our customers, we will no longer block the injection based plugins in June. Instead we will continue to monitor the situation around us and, when ideal, will block the plugins at a as yet undefined date in 2020. In the meantime, please do continue to follow the instructions below. 

In 2020 only the add-ins from the Microsoft store will work. Injection based native plugins will be disabled. If you are an IT administrator please move your organization to the add-in version of the plug-ins.

Add-ins from the Office 365 store will continue to work. With this change, plugins like WebEx, Zoom, & Vera will stop working as they cause instability and are a security risk. We are reaching out to customers who use the injection based native plugin so that they are informed and can work on a plan to migrate to the Office 365 add-ins. 

Why is this happening?

With the release of MacOS Mojave and Catalina, Apple has blocked most injection-based plugins from running due to security & stability concerns. With this change, Microsoft will be closing the gap by blocking all injection-based plugins. In order to continue using services like Zoom & WebEx, you will need to migrate your users to use the Office 365 add-ins which are supported.

How does this affect me?

In the past, you were able to download injection based native plugins and use them inside Outlook for Mac. Once this block is in place, you will no longer be able to use these. For example, if you use WebEx to create online meetings in Outlook for Mac, you will no longer be able to do so.

I am an IT admin, what do I need to do to prepare for this change?

  • Determine if you have these plugins deployed in your tenant

  • Work with your tenant administrators to help download & deploy the add-in replacements from the Office 365 add-ins store. These add-ins are supported today in Outlook for Mac.

  • You must also uninstall the injection based native plugins to ensure that they do not try to interact with Outlook for Mac.

  • A table of the most used plugins are listed below -


Native Plugin

O365 add-in replacement

Cisco WebEx

WebEx Productivity Tools

WebEx Meetings Scheduler

Zoom Meetings

Zoom Plugin for Microsoft Outlook

Zoom add-in for Outlook

Symantec DLP

Symantec DLP

O365 add-in in development

Vera Security

Vera for Microsoft

O365 add-in in development

What are the benefits of the O365 add-ins?

Office 365 add-ins are designed to be written once and work for all Outlook versions. These are built on top of a supported add-in platform, hence reducing the possibility of crashing. Which means you can install the add-in for Outlook for Mac, and it will work in Outlook for Windows & Web. Tenant administrators can configure the add-in to be deployed automatically to all users within the tenant.

Will these O365 add-ins work if I am on-prem ?

Yes, we are currently adding support for these O365 add-ins for On-premise customers too. We will ensure that both O365 and On-premise accounts will be supported by the new add-ins before blocking the injection-based plugins.

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