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Installing the Sophos Outlook add-in for Encryption

The Sophos Outlook add-in allows users to encrypt messages with one click from within Outlook.

The add-in is available for Outlook (Windows or macOS version) and Outlook on the web (formerly OWA) and is compatible with some Microsoft 365 (formerly Office 365) and Exchange environments.

Is my environment compatible with the add-in?

The add-in works for mail accounts in the following environments:

  • Exchange Server 2013 or later (on-premise Exchange).

    Exchange Server 2013 API version 1.4 or older isn't supported.

  • Microsoft 365 Business subscription (Exchange online).

Note

Non-Microsoft mail providers (such as Gmail or other POP/IMAP accounts) aren't supported.

Compatible mail clients

  • Outlook for Windows 2013 and later.
  • Outlook for Mac 2016.
  • Outlook on the web (Microsoft 365 only).

Download the add-in for Windows

Windows users must use the msi installer. To download the installer, do as follows:

  1. Go to Global Settings > Encryption settings.
  2. Click the Download Windows Outlook Add-in link.
  3. Save this file in a location where you can access it during the deployment step.

Download the add-in for Macs or OWA

Note

If you're using macOS, make sure encryption is turned on before you download and install the add-in.

To turn encryption on or off, go to Global Settings > Encryption settings.

Mac/OWA users must use the XML manifest file. To download this, do as follows:

  1. Go to Global Settings > Encryption settings.
  2. Click the Download Web/Mac Outlook Add-in link.
  3. Save this file in a location where you can access it during the deployment step.

Deploy the add-in

You use Microsoft's add-in deployment process for deploying the add-in. For each step, we link to appropriate instructions or advice provided by Microsoft.

Note

We recommend that you check the latest information provided by Microsoft on deploying add-ins before proceeding. You should use the instructions provided by Microsoft if there are any differences from the help we provide.

To deploy the add-in, do as follows:

  1. Test whether your users can install the add-in. To do this, follow the instructions in Sideload Outlook add-ins for testing.

    Sideloading is recommended for proof of concept and testing purposes only. It refers to the process of installing the add-in for a user.

  2. If you want to use Microsoft Centralized Deployment, check if centralized deployment of add-ins works in your environment. For more information, see Determine if Centralized Deployment of add-ins works for your organization.

  3. When you're ready to begin centralized deployment of the add-in, follow the instructions in Deploy add-ins in the admin center.
  4. For customers in an on-premise environment without a connection to Microsoft 365, use the Exchange Admin Center to install the add-in for your organization. For more information, see Exchange admin center in Exchange Server.
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