Installing the Cyren Inbox Security Outlook Add-in
Office 365 Admin Center
Add in the Manifest File. The URL must be used exactly as shown, otherwise, the installation will fail. You must use the following URL for installing the Inbox Security Outlook add-in: https://admin.cyren.cloud/inbox-security/outlook/addin/cis-manifest.xml
Before you begin the installation, check the following prerequisites instructions provided by Microsoft: https://docs.microsoft.com/en-us/office365/admin/manage/centralized-deployment-of-add-ins?view=o365-worldwide