Week 29:

Email coexistence

Email coexistence enables organizations with on-premises Exchange Server email environments to establish a connection between their on-premises mail environment and the Office 365 Exchange Online mail environment. With coexistence configured, some users connect to Exchange Online while others continue to use the local Exchange Server environment, and all of the users can share the
same email domain name. Email coexistence can be configured as either cross-premises coexistence or as a hybrid deployment.