I’ve used Office 365 for several years and recently wanted to reach Windows Azure Active Directory. How to do that was not obvious, but a video on MSDN Channel 9 opened my eyes. After watching this and reading the comments, I logged in to https://activedirectory.windowsazure.com with my “.onmicrosoft.com” Microsoft account (formerly Live ID). In order to reach the web site using my Organization account I logged into Office 365 first, then browsed to it. Both accounts are administrators.

The Channel 9 video is “What is Windows Azure Active Directory?”