Microsoft executives said one of the compelling new features under development is known as "shadow copy", which offers a point in time view of files on a server.
"If you have ever deleted something on a file server that you shouldn't have, you'll be able to find older versions of it," said Jay Jamison, group product manager for Windows .Net.
Jamison said shadow copy provides an "additional safety net" for users, because it is embedded at the server level.
On the broader collaboration front, Microsoft views .Net Server as the application platform that will enable a richer user experience. The platform will contain the session initiation protocol (SIP) and a number of application program interfaces for developers to build communication functions.
The SIP protocol is used to establish two-way communication sessions, used in real-world applications such as voice over IP and rich instant messaging.
Cliff Reeves, Microsoft's vice-president of marketing for .Net Server, said the product's positioning as an application server sets it up as the ideal platform to manage such services.
Companies are looking for ways to secure instant messaging as a business asset on their network, particularly as they start to look for ways of collaborating using products such as Microsoft's Sharepoint Team Services, said Reeves.
Dwight Krossa, director of product marketing for Windows .Net, said the final release of .Net Server will contain improved scalability, management and security features.