Exchange Online provides cloud-based email and calendaring services with benefits of lower costs, simplified management, and increased security and reliability compared to on-premises email. Key features include business-class messaging, 24/7 support, Active Directory integration, large mailbox sizes up to 25GB, and geo-redundant data centers. Optional services include archiving, coexistence with on-premises email, and a low-cost subscription for deskless users. The presentation provides an overview of Exchange Online and its capabilities.