I added for testing purposes Access to Azure Active Directory in Windows Azure. Now I realize there is no button to cancel the subscription:
As discussed here "the underlying directory for Office 365 is Azure Active Directory (AAD). This means that if you have an Office 365 account, you already have a directory -or "tenant"- in AAD."
1) Does this mean that this particular subscription has always been there - just not visible?
2) Can you cancel it?
3) According to the pricing list adding objects is free (Free up to 500,000 objects), Application Enhancements (Preview) and Access Control. At which point would I be billed? (I know Azure generally bills for usage, the question is what counts as the usage in this particular situation)