We are currently in process of switching from M4 to ESRI. It's a lot easier than you think, and there are about 5 or 6 that have switched already. ESRI's software is far superior, in every aspect, and cheaper. And there are several ESRI business partners that make good Telecom extensions: Ericsson, Schneider, & Palmetto Engineering & Consulting. You can send me a direct message if you like. We have a good contact at ESRI. There is light at the end of the tunnel.