Your company has a hybrid deployment of Office 365. All mailboxes are hosted on Office 365. All users access
their Office 365 mailbox by using a user account that is hosted on-premises. You need to delete a user account
and its associated mailbox. Which tool should you use?

A.
The Remove-MSOLUser cmdlet

B.
The Remove-Mailbox cmdlet

C.
The Office 365 portal

D.
Active Directory Users and Computers

Explanation:
In a hybrid deployment of Office 365, the user accounts in the on-premise Active Directory are replicated to the
Azure Active Directory using the Azure Active Directory Sync Tool (DirSync). This enables users to access
Office 365 resources such as Exchange Online mailboxes by using the on-premise Active Directory credentials.
Any changes to a user account must be performed in the on-premise Active Directory. The changes will then be
replicated to Azure Active Directory.
To delete a user account and mailbox, the user account must be deleted in the on-premise Active Directory.
The user account deletion will be replicated to Azure Active Directory. The Exchange Online mailbox will then
be deleted.