Recently I purchased two new servers and a MSA to run a clustered Exchange environment. I was running Exchange 2000 on Windows 2000 Server with Instant Messaging enabled (using Windows Messenger v5.1). However, Microsoft being as smart as they are decided to take messaging out of Exchange Server 2003 and create a whole new server package out of it (Collaboration). I don't want to purchase another package but I have heard of a way to make messaging work with Exchange Server 2003. But, I cannot find any information on this. Any ideas?