Amazon WorkSpaces now allows you to integrate with your on-premises Microsoft Active Directory using an interforest trust with the AWS Directory Service for Microsoft Active Directory (Enterprise Edition), also called AWS Microsoft AD. By establishing a single interforest trust relationship, you can assign Amazon WorkSpaces for users in any of your on-premises domains. AWS Microsoft AD automatically discovers and routes authentication requests to the correct domain controller, which means that your users can use their existing Microsoft Active Directory credentials to log in to their WorkSpaces, without having to specify their domain name.