Patent ID: 7895282

Claim:
A method for delivering an internal mail over the Internet, the method comprising: displaying on a first client machine a user interface for authoring the internal mail, the user interface including at least a recipient area, a subject area and a message area, wherein the recipient area allows a user to select at least one identifier representing at least a recipient to receive the internal mail, the subject area includes a topic to indicate what texts in the message area are related to; transferring the internal mail to a server in a collaborative communication system when the user decides to send the internal mail to the recipient, wherein the collaborative communication system includes communications among users registered with the collaborative communication system, the communications include file sharing via a file repository, the internal mail exchanging via the server and electronic messaging within the collaborative communication system, each of the registered users is assigned an identifier by the collaborative communication system, any of the communications is delivered per the identifier of one of the registered users, and wherein the recipient and the user belong to a group formed by some of registered members in the collaborative communication system, the group defines a circle within which group members are allowed to communicate with each other, a member outside the group is not allowed to communicate with any of the group members in the group; and delivering the internal mail from the server to a second client machine when the recipient logs into the collaborative communication system via the second client machine, wherein said transferring of the internal mail to the server and said delivering of the internal mail from the server to the second client machine are performed without relying upon an email address commonly known to include an @ sign, and a user name or a domain name in the email address.