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Exchange Online
Microsoft Exchange Online is an email, calendar and contacts solution delivered as a cloud service, hosted by Microsoft. Built on the same technologies as Microsoft Exchange Server, Exchange Online provides end users with a familiar experience across PCs, the Web and mobile devices, while giving IT administrators or small businesses and professionals Web-based tools for managing their online deployment.

Microsoft Exchange is available both as on-premises software and as a hosted service with Exchange Online. Customers can also choose to combine both on-premises and online options in a hybrid deployment.

History
Exchange Online was first provided as a hosted service in dedicated customer environments in 2005 to select pilot customers. Microsoft launched a multi-tenant version of Exchange Online as part of the Business Productivity Online Standard Suite in November 2008. In June 2011, as part of the commercial release of Microsoft Office 365, Exchange Online was updated with the capabilities of Exchange Server 2010.

Exchange Server 2010 was developed concurrently as a server product and for the Exchange Online service.