If you're looking to reduce admin headache and get exchange have you considered win 2008 r2 for AD and a hosted exchange solution? You won't need to worry about opening ports for owa etc and someone else can take on the hassle of looking after exchange (admitedly not huge with sbs). The only thing you'll need to do is install a tool for ad/exchange credential management (MS has tool(s) for this).
I've got a linux system filtering mail and forwarding requests on port 80 to port 443 on my sbs machine. Combined with my firewall setup this means I only have port 443 and 1723 (vpn) on the sbs box accessible from the internet.
I've got a linux system filtering mail and forwarding requests on port 80 to port 443 on my sbs machine. Combined with my firewall setup this means I only have port 443 and 1723 (vpn) on the sbs box accessible from the internet.
