Incoming Mail Configuration

After a major server crash, I was faced with a major delimma reinstall my SBS 2003 server or upgraded to Windows SBS 2008.  I was advised to take the latter would be my best option by my reseller.  I purchased the new hardware and licenses for SBS 2008.  I installed the OS successfully, thought I had configured the server correctly until I realised I was not receiving any incoming mail.  I can successfully sent mail but for some reason, mail was building up in my ISP's mailbox.  

I have now discovered that due to the fact that 2007 doesn't have a pop3 connector and the fact that I have a dynamic IP address my ISP can not forward our mail to my server.  ANd this is the crux of my problem.  Stupidly I expected SBS 2008 to be the same as 2003 but am realising this is not the case.  Does anyone have an idea of how I can get mail to my server.  

I have setup a dyndns address which is updated automatically by their utility and allows me remotely access to my server. I was contemplating either using a 3rd party pop3 client but lack after reviewing the offering there seems a lack of exchange 2007 support .  

My alternative would be to try and forward the remote.mydomain.co.uk MX record at my ISP to DynDNS and then rely on the DynDNS Service to forward the incoming mail to my server.  Trouble I dont know if this will work since this is at the limit of my knowledge and I am not sure what entry I should make?  I send mail via the SMTP server through my ISP's server which works fine.  I have seen this problem on various site but not resolution.