Secure Messages Outlook add-in

The Secure Messages Outlook add-in secures outbound email messages with attachments when sent by any of your users via their Microsoft 365 account. Alternatively, users can send, receive, and manage secure messages directly from the Secure Messages web portal.

Sending a message in Outlook using the Secure Messages add-in is optional. You can continue to send unsecured messages through Outlook, as normal, without using the add-in. For more information, see Using the Outlook add-in.

Microsoft Outlook compatibility

The Secure Messages Outlook add-in is compatible with the following versions of Microsoft Outlook:

Outlook 2013 or later on Windows
Outlook 2016 or later on Windows
Outlook 2019 or later on Windows
Outlook 2013 or later on Mac
Outlook 2016 or later on Mac
Outlook 2019 or later on Mac
Outlook on the web
Outlook on Windows (Microsoft 365)
Outlook on Mac (Microsoft 365)

Prerequisites

Make sure you meet the following prerequisites to use the Secure Messages add-in:

The Email Security module is enabled in your workspace.
The Secure Messages add-on is enabled in your workspace.

Installing the Secure Messages Outlook add-in

Admin users can deploy the Secure Messages Outlook add-in to devices through Microsoft AppSource (https://appsource.microsoft.com/). Coro provides a direct link to the Secure Messages for Outlook add-in page in AppSource in the console.

Alternatively, depending on your organization's applications policy, end users can individually install the add-in directly in Outlook.

Deploying through Microsoft AppSource

To view the Secure Messages for Outlook AppSource page:

Sign in to the Coro console.
From the sidebar, select Control Panel:
Select Email Security:
From the Email Security configuration page, select Secure Messages:
The Secure Messages tab is only enabled if the Secure Messages add-on is enabled for your workspace.
Select Install for Outlook 365:
Coro redirects to the Secure Messages for Outlook AppSource page.
Follow the on-screen instructions to install the Secure Messages add-in for your users.

Installing individually

To install the Secure Messages add-in directly in Outlook:

Select the Message ribbon, then select Apps:
In the Apps dialog, select Get add-ins:
In the Add-Ins for Outlook dialog, enter Secure Messages into the search field:
Outlook displays search results dynamically as you type.
Select Coro's Secure Messages for Outlook add-in from the list of search results.
Outlook displays the add-in information page:
Select Add.
Outlook installs the add-in.

Using the Outlook add-in

Important

To use the Secure Messages add-in, make sure to add the sender to the Protected users list in the Coro console.

You can use the Secure Messages add-in directly from your Outlook environment when:

Composing a new message.
Replying to a message.
Forwarding a message.

To use the Secure Messages add-in from Outlook:

The following installation instructions apply to Outlook on Windows (Microsoft 365).

Enter the recipients, subject, message, and any necessary files while composing, forwarding, or replying to a message.
Select the Message ribbon, then select Apps:
Select Secure Messages:
Outlook displays a message confirming that the Secure Messages Outlook add-in is active.
If Secure Messages does not appear in the add-in list, see Installing the Secure Messages Outlook add-in.
When the message is ready to send, select the Secure Messages option from the toolbar:
Outlook sends the message securely via the Secure Messages add-in and displays a confirmation message:
Outlook does not keep a copy of messages sent via the Secure Messages add-in in the Sent folder. To view your secure messages, access the Secure Messages web portal.

For further information, see Secure Messages.