I too would be interesting in purchasing a 25 user pack oppsed to a 100 pack. I am a small business it consultant with far less than 100 users and a 25 user pack would be perfect. May be call it Small Business Edition. so far i have spent $500 for 12 users, which is far, but i would have prefered the ISP Edition. Is there an upgrade path from pro to ISP Addition also?