Microsoft Monday is kicking off a beta program to introduce online infrastructure services around Exchange 2007 and SharePoint 2007 to corporate users of any size.

The company also plans to have a beta of Office Communications Server (OCS) available in the second half of 2008, called Office Communications Online, to round out its suite of online services, which will also include Web-based conferencing via Live Meeting.

 Bill Gates, Microsoft's chairman, announced the online services during his keynote address at the opening of the SharePoint Conference in Seattle. In addition to the services announcement, Gates also said SharePoint has passed 100 million licenses sold, has attracted 17,000 user companies, and eclipsed $1 billion in sales. 

He also unveiled general availability for Microsoft Search Server 2008 Express, a free enterprise search engine introduced in November.

Gates also rolled out Silverlight Blueprint for SharePoint, which is designed to integrate interactive Web applications with SharePoint's content management capabilities. The Blueprint includes sample applications that combine Silverlight and SharePoint.

But it is on the services front where Microsoft is finally extending itself beyond the orchestrated engagements with larger companies and where it will make its most dramatic entry as a hosting company.

Over the past three years, Microsoft has been testing the services with customers that have more than 5,000 users, including Energizer and XL Capital.

Microsoft said Monday that list is expanding to Coca-Cola Enterprises, Autodesk, Blockbuster, Ceridian, Ingersoll-Rand and PFT-Medway.

Just last year, Microsoft pulled its services test out of incubation and created Microsoft Managed Services to offer online infrastructure services to large customers.

Now, it plans to offer the services to anyone. The initial beta will be private but will include thousands of users, according to Eron Kelly, director of online business services for Microsoft. The company is accepting applications for the beta program on its Web site.  

Kelly says Microsoft has developed a multi-tenant -ike architecture to help scale the applications but has not rewritten any code to incorporate multi-tenant capabilities like it did earlier this year with its Dynamics CRM 4.0. A multi-tenant architecture allows a single instance of the application to support individual deployments for multiple companies.