If you have a small establishment and are not configuring an Edge Transport Server in your environment then you will have to configure your Hub Transport Server (which could also be your Client Access Server as well as Mailbox Server) to allow internet mail flow from your Hub Transport Server.
Before you proceed with these instructions [...]
Another issue that I had before I got the Exchange 2010 installed and working on my Windows Server 2008 R2 Enterprise edition was that it would keep giving me an error saying cannot access default website.
After making sure that all prerequisites for installing Exchange 2010 was met (like installing IIS, .NET etc) I proceeded to install the [...]

