During Strong Angel II in 2004, Steve Birch, Steve Price and I conducted a series of experiments around a concept we called The Pony Express, which involved the use of Groove-based “mobile infrastructure” to deliver data synchronization services to users beyond the horizon of connectivity. For Strong Angel III, we will revisit the concept using the neutral, platform independent SSE replication protocol. First, I’d like to set the stage with a bit of background on the problem we were originally setting out to address.