You may for integration reasons desire to change the default IP address from it’s Microsoft set standard of 10.0.0.2 to some other address range. Microsoft have given a detailed step-by-step how to do this in a knowledge base article “Change the Default IP Address in Small Business Server [Q194562]”
Essentially the key steps are as follows.
1. Change the IP address in the TCP/IP properties, change also the WINS server IP to point to the new IP.
2. Change the DHCP scope accordingly and create a new scope with the correct options and settings
3. Change the LMHOSTS file as it contains an IP address which points to 10.0.0.2
4. Change the LAT for MS Proxy, and other various proxy config files as detailed in the KB article (although I have only seen server names here and not IP addresses)
Thant should be it!