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Microsoft Exchange Online is a hosted messaging solution that delivers email, calendar, contacts and tasks from PCs, the web and mobile devices. It is fully integrated with Azure Active Directory, so administrators can use group policies as well as other management tools to manage Exchange Online features across their environment.
Organizations that subscribe to Exchange Online retain control over the messaging services they offer to users. With the hosted Exchange Online plans described in this document, the email feature is hosted on servers that support multiple customers simultaneously. These servers are located in Microsoft data centers and are accessible to users on a variety of devices within a corporate network or over the Internet.