Yes, you need to install a domino server on your Blackberry machine. I installed my server as an enterprise server which works beautifully. As long as you have the "new" Domino server within the same Notes Named Network you don't need to worry about communication from a BES standpoint. BTW, you can download a very good Administration guide right of the rim website, describing step by step what you need to do. From a domino standpoint, you still need replication documents to replicate the Address book and other critical DB's but that's no different then any other domino server. I'm not 100% if there's a Blackberry for Linux version, myself I have it on Windows 2000 server so you need to look at that as well.