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 Web Services (EWS), an alternative to the MAPI protocol, is a documented SOAP-based protocol introduced with Exchange Server 2007. Exchange Web Services is used by the latest version of Microsoft Entourage for Mac and Microsoft Outlook for Mac - since the release of Mac OS X Snow Leopard Mac computers running OS X include some support for this technology via Apple's Mail application.
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In November 2007, Microsoft released SP1 for Exchange Server 2007. This service pack includes an additional high-availability feature called SCR (Standby Continuous Replication). Unlike CCR, which requires that both servers belong to a Windows cluster typically residing in the same datacenter, SCR can replicate data to a non-clustered server, located in a separate datacenter.
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