Planning and implementing an Exchange hybrid organization
The easiest deployment of Exchange Online is simply performed by assigning Exchange Online mailbox licenses to users. The service already has all the necessary supporting infrastructure components in place—all that’s missing are users’ mailboxes.
That, however, is not how most organizations adopt Exchange Online. Many organizations have existing on-premises Exchange Server-based organizations. Fortunately, Microsoft provides a native mechanism to help organizations methodically onboard users to the Exchange Online environment. This process, commonly referred to as an Exchange hybrid migration, involves enabling either a new or existing Exchange server with configuration objects to allow data to flow between the on-premises and cloud environments. This hybrid functionality allows for cross-premises free/busy calendar lookups, distribution list membership, mail routing, and even mailbox migration.
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