Hi I would some help in determining the best version of CallManager& Unity to upgrade to. I'm tasked with coming up with a logical upgrade for our system. We are running CCM4.0 cluster 1Pub & 1Sub, Unity 4.0(5) on MCS 7800 Servers(which I believe is no longer supported). CCM runs on Win2k Unity on 2003. Basiscally I'm trying to determine which version to upgrade us to, keeping in mind that we will be moving to Exchange 2007 towards the end of this year. I would really appreciate it if someone can throw some ideas out.