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Presence service provides users with information about others users' availability, willingness to communicate and preferred means of communication. Presence information can serve as an input for innovative applications which act differently depending on the state of the user and their location. In enterprise environments, such information can greatly increase productivity by allowing employees to efficiently manage their meetings, communication and other work-related tasks. In this article, we explain the basic and extended presence system architecture. We demonstrate the architecture for enterprise environment that combines presence information from various sources and provides it to consumers. The central parts of the system are IMS core and presence server. We propose presence server architecture which is Java based and scalable. We present an implementation of presence architecture and demonstrate its usefulness with an application that provides employees with information about coworkers' locations and communication capabilities and allows them to instantly start the communication.

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Important features of the K nowledge Manag ement Systems, based on the In formation and Communication Technologies (ICT) ar e described in the fir st section. These f eatures emphasiz e the import ance of W eb 2.0 concepts whic h f oster user generated con tent dev elopment as well a s ef fective cont ent filt ering a nd selection capabilities (e. g. R eally Simpl e S yndication-R SS f eeds). The mos t pop ular commun ity port als (blog ging, vide o, etc.) now adays g enerate mor e con tent than ev er bef ore. This new par adigm, wher e user s become activ e participants instead of passive observers, calls for improvements in quality assessment and demands the adaptation of user generated content, so that it could be used f or the wider interested audience. On the other hand, corpor ate or academic environments do not benefit fr om the community orien ted W eb 2.0 adv antages dir ectly. K nowledge Management challeng es in th ese en vironments lie in the meaningful and tight integration of the Learning Manag ement Systems (LMS) into the existing knowledge resources and information systems. This enables cr eation of per sonalized learn ing en vironments f or t arget user s, which is described in the second section. Sub sequently, some of the c ase s tudies, which ar e in corporated in to the ECHO Learning Mana gement S ystem at the F aculty of Electric al Engineering, University of Ljubljana, Slov enia, are presented. Conclusions of the paper d escribe future research and development w ork, based on our e xperiences and new learning paradigm, putting learners into the c entre of the educational process.

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