System and methods for enhancing user productivity by integrating multiple services and providing a centralized output to a user is disclosed. A message notification server may receive store a set of notification rules and, as various notifications are received, the server may dynamically monitor them for processing to users. The system may automatically re-rank the notifications based on changed conditions or to present messages of greatest urgency or importance. The system may also store sender-specific sets of rules, governing how notifications are to be handled for different application servers or services.