Setting up Exchange 2003 on SBS 2003 with a dynamic IP Address

Assuming you want Exchange to receive incoming mail using SMTP you will need to set up a DDNS service (Dynamic Domain Name Service). A DDNS service tracks you changing IP and associates it with a domain name, by installing a small update client on your server, such as:
http://www.dyndns.com/support/clients/windows.html
Though there are several free DDNS services, with those they assign you a domain name such as MyNem.homedns.org  That will not work in your case. You need to register a domain name that you wish to use for your mail such as mail.MyDomain.com  and then have that associated with the DDNS service. This can be done using services by www.dyndns.com, or www.no-ip.com, but they are paid services. dyndns charges about $25/year for their "Custom DNS" service:
http://www.dyndns.com/services/dns/custom/

Then you configure SBS by running the Configure e-mail and Internet Conection Wizard, and your router will need port 25 forwarded to the IP of the SBS server.

You can also configure Exchange to pick up mail from an existing POP account. This does not require any DDNS service and doesn't care if you have a static or dynamic IP. However, it is not as efficient as the above.

Thanks for that,

I think I would like to try and configure exchange to pick up mail from an existing pop account. How does this work. What details do I need to enter?

What are the disadvantages. Is it worth getting a static ip address?

Thanks Clear1975.
Cheers !
--Rob