Microsoft Online Services offers the Business Productivity Online suite , which includes Exchange Online, SharePoint Online, Office Live Meeting, and Exchange Hosted Filtering. These enterprise-class applications are delivered as a subscription service, hosted by Microsoft. This offering can get your business IT up and running quickly, with predictable costs, high security, and built-in business continuity and disaster recovery.
You can view or listen to a technical overview of the Business Productivity Online suite here. This is a 200-level presentation that includes demos, technical information, options, and pricing.