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 (OWA) and is compatible with some 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.

  • Office 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 2016.
  • Outlook for Mac 2016.
  • Outlook Web Access (Office 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 Overview > 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 Overview > Settings > Encryption settings.

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

  1. Go to Overview > 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 Sideloading installation instructions.

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