Universities have traditionally been an essential and core component for alumni related communications, news, and activities but recent social and technological changes have meant that a growing level of alumni activity may be occurring independently and "off the radar" of the formal alumni relations programme. This presentation will introduce the concept of 'communities of practice' as a useful framework for better understanding the internal dynamics of an alumni network, and will offer possible strategies for both realigning alumni relations practices and engaging with "lost" alumni. The presentation was delivered at the annual conference for Flemish and Dutch Alumni Officers and University Fundraisers (NAFF - Nederland Alumnirelaties, Fondsbeheer en Fondsenwerving) held on May 15th and 16th, 2009 at the University of Leiden in the Netherlands.