Specific things to reflect upon. If you have already installed a pure Exchange 2007 oraganization, unfortunately you are out of luck. You can't deploy an Swap 2003 hosting server into your org and have it to figure. You can build a Exchange 2003 server first into the org, then add an Exchange 2007 server to the mix, if you haven't deployed any Exchange servers yet. This is going to accommodate usability of the 03 Change Program Administrator or ESM and also enhancing power to the products.
