I have a few SBS 2011 boxes that I manage and 1 in particular is giving me trouble. It's a single server environment with a mix of laptop and desktop clients, all running Windows7. Here's what I've been able to ascertain: If I assign just the SBS2011 server's IP as the only IP address in DHCP, then client computers have massive problems with DNS resolution of websites. Websites load slowly, or sometimes fail to load at all. If I assign something like the router IP, ISP DNS, or google public DNS as a secondary DNS server then web browsing works fine....but Outlook Out of Office doesn't work! We are using the Exchange server on the SBS box. Clients that VPN in (PPTP to SBS2011) can use Out of Office fine. It also works fine in OWA (either in, or outside of the office). I'm a little stumped, any ideas?