Microsoft® Exchange Online is a hosted enterprise messaging solution based on Microsoft Exchange Server 2007. Exchange Online helps give your business the e-mail security it demands, your employees the e-mail access they want, and your IT staff the operational efficiency it needs. The service leverages our deep knowledge of Microsoft products, best practices developed with customers and partners, and our global infrastructure to deliver a world-class, mission-critical service.
The Exchange Online service includes advanced e-mail features as well as calendaring, contact, and task management capabilities. Exchange Online also provides built-in spam control and virus scanning to reduce common security risks that are associated with e-mail files.
Exchange Online Standard is a Microsoft Online Services offering designed for rapid service adoption by an organization. It includes a standardized Web-based administrative console that makes it easy to manage and set up services for users. It is available as a standalone service or as part of the Business Productivity Online Suite that also includes Microsoft SharePoint® Online, Microsoft Office Communications Online and Microsoft Office Live Meeting.
http://bit.ly/Dpxgs