Starting today, AWS Directory Service for Microsoft Active Directory , also known as AWS Managed Microsoft AD, enables you to share a single directory with multiple AWS accounts. This makes it easier and cost-effective for you to deploy your directory-aware workloads on Amazon EC2 instances by reducing the manual configuration to domain join your instances and, the need to deploy directories in each account and VPC. Amazon EC2 instances can now seamlessly join to a single directory from any AWS account and any Amazon VPC within an AWS Region.