Abstract: A messaging system with messaging accounts for users of the messaging system comprises a group messaging service for transmitting and receiving messages via a network between users in each of plurality of messaging groups, those users having messaging accounts associated with that messaging group. An organization management system with member accounts for members of an organization comprises a registration service for registering user identifiers with the member accounts. An information retrieval service of the organization management system generates a group information request comprising a user identifier registered with one of the member accounts. A system interface communicates to the organization management system, in response, information about at least one of the messaging groups associated with a corresponding one of the messaging accounts comprising a matching user identifier.

Abstract: Technologies are described herein for relevance-based expiration of data. An initial expiration time for the data is computed based upon an expiration duration associated with the data. The expiration time for the data is periodically re-computed in order to extend the expiration time. A relevance value for the meeting data is computed and the expiration time is set as a function of the computed relevance value. The relevance value may be computed as a product of a user-settable relevance value for the meeting data and a dynamic relevance point for the meeting data. When the computed expiration time for meeting data has been reached, the meeting data is expired, such as through the deletion of the meeting data.

Abstract: A system is provided for using a communicator application to identify experts and to establish communication with experts. A computing device in the system causes a display device to display a graphical user interface (GUI) of the communicator application to a first user. The communicator application is an application that initiates communication sessions between users. Subsequently, the computing device receives search input via the GUI. The search input indicates a type of expertise. After the computing device receives the search input, the computing device causes the display device to display a user identifier within the GUI, the user identifier identifying a second user. The second user possesses the type of expertise indicated by the search input.

Abstract: Technologies are described herein for relevance-based expiration of data. An initial expiration time for the data is computed based upon an expiration duration associated with the data. The expiration time for the data is periodically re-computed in order to extend the expiration time. A relevance value for the meeting data is computed and the expiration time is set as a function of the computed relevance value. The relevance value may be computed as a product of a user-settable relevance value for the meeting data and a dynamic relevance point for the meeting data. When the computed expiration time for meeting data has been reached, the meeting data is expired, such as through the deletion of the meeting data.