Explanation/Reference:
Explanation:
* Scenario: Contoso identifies the following Office 365 coexistence requirements:
/Office 365 users must be able to access their mailbox by using their Active Directory user account in Contoso.
/On-premises users must be able to share free/busy information and calendar information with the Office
365 users.
A: When you create an Office 365 mailbox in Exchange Online in a hybrid deployment, the mail user is created in Active Directory on-premises. Directory synchronization, if it's configured, automatically synchronizes this new user object to Office 365, where it's converted to a cloud mailbox in Exchange Online. You can create Office 365 mailboxes as regular user mailboxes, resource mailboxes for meeting rooms and equipment, and shared mailboxes.
B: Step-By-Step: Setting up AD FS and Enabling Single Sign-On to Office 365