New AWS Directory Service
aws.amazon.com/blogs/aws/new-aws-directory-service
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Today we are introducing the AWS Directory Service to address these challenges! This managed service provides two types of directories. You can connect to an existing on-premises directory or you can set up and run a new, Samba-based directory in the Cloud.