Recently a company that I deal with has moved to Office 365 -- this has entailed moving a number of identifies into Microsoft Azure AD (think Active Directory, existing on Azure and usable for SSO activity) and signing up for Office 365 services.
No problem - or so you'd think.
When trying to signin on a Microsoft site with an enrolled Organisation account (that is, an account on the Azure AD), the OLD LiveID was being used intermittently. A quick chat with Microsoft confirmed this -- Organisation and LiveID's can exist on the SAME email address at the same time - surely a situation where it can lead to confusion!
The good news is you can disable / deactive your LiveID to drop back to just using the Org account (where possible at least), but it does mean you have to be careful during the deactivation period to ensure you sign in at the right place (best to use office365.com addresses!).
However, the world gets a bit murky if you are using MSDN it seems: https://www.visualstudio.com/get-started/setup/link-msdn-subscription-to-organizational-account-vs
Am I the only one that can see this being a total nightmare for companies with a large dev population or other LiveID usage?