Microsoft on Monday pulled out of incubation its online enterprise services around Exchange, SharePoint and Communications Server and introduced a free document storage and collaboration Web site that begins to answer challenges from Google.

The newly branded Online services had been offered as part of Microsoft Managed Services, launched three years ago as an incubator for providing hosted services to companies with more than 5,000 users.

Currently Energizer, XL Capital and two unnamed companies are buying managed services from Microsoft around the three collaboration servers: Exchange, SharePoint Server and Communications Server. 

Now those services are generally available beginning Monday to any enterprise with more than 5,000 users as a hosted service from Microsoft or from one of its partners.

The Online offerings are the tip of Microsoft’s strategy to combine its traditional software and online services. The company says it plans to unveil other Online services and Live Web-based services, such as the free document storage called Office Live Workspace, in the coming months.

CEO Steve Ballmer told attendees in July at the company’s annual Partner Conference that services hosted by a partner, Microsoft itself or any combination of those two will lead a revolution to combine today’s technology with new service models.

To support that effort, Microsoft has been building out its data center capacity around the globe to go along with its operation in Tukwila, Wash., where they host much of the Managed Services operations. The company recently bought two data centers in Santa Clara for $200 million, opened another in Quincy, Wash., earlier this year and broke ground in July on another in San Antonio, Texas.

With those facilities in place, Microsoft is adding the services to a lineup that already includes Live Meeting for online conferencing and Exchange Hosted Service, an e-mail hygiene service.

“What we are offering is the power of choice,” says Eron Kelly, director of product management for Microsoft’s business online services group. “You can choose on premise, get a partner-hosted solution or come to Microsoft and get a Microsoft hosted version of the technology.”

The new services around Exchange, SharePoint and Communications Server will provide users with a dedicated environment configured to their specifications in the Application Service Provider model.