Learn how to create , modify , view and filter , and delete mailboxes.

Use contacts to represent people outside your organization in the shared address book.

Create and configure resource mailboxes so users can easily reserve rooms and equipment.

Create mail users in Outlook Live to represent mailboxes in your on-premises Exchange organization.

Use proxy addresses so users can receive messages sent to different e-mail addresses. You can also change the primary e-mail address on any user's account .

Learn about the maximum size for e-mail messages and mailboxes, the maximum number of recipients per message, and the guidelines for managing recipient rate limits.