Perspective...
I think the feature most people don't realise is that the config files are templated.
Change your internal IP? Change the setting in the web admain, and hit apply...
SME will reconfigure web, email, relay filters, *FIREWALL*, ldap, samba, etc.
If the service isn't used or is denied to external users, the application is configured to not listen *and* the firewall is automatically configured to block traffic to that service.
It's the SBS 2003 of the linux world - it's not SBS2008, but plenty of us are annoyed with the crap we've put up with to configure SBS2008 or the preview SBS2011
I'm a big fan of e-smith/SME Server but I work with a MS Gold Partner. Anybody who doesn't want to spend the cash on hardware and licenses, we recommend SME and point them to Contribs to make a donation.