Found this interesting.
http://blogs.technet.com/b/ad/archive/2015/10/14/azure-ad-domain-services-is-now-in-public-preview-use-azure-ad-as-a-cloud-based-domain-controller.aspx
 
To be fair, I work for Microsoft.  I am not trying to spam anyone, I just thought it was a pretty big deal and thought others would also find it interesting.
Thank You
 
Paul Bergson
pbbergs@xxxxxxxxxxxxxxxx