My client was originally on a Hosted Exchange 2007 environment and due to the latency and bandwith contention, I was forced to buy a brand new server with SBS 2008 and bring the email back in house.
After completely backing up their local desktop profile, necessary outlook files, etc... and joining to the new domain, I was able to quickly sign into the new server and get their new email setup in Outlook.
I then took their back-up of their .pst from the Hosted Exchange 2007 server and imported it into their newly created Outlook Exchange SBS 2008 account.
Now the only thing that doesn't work is the ability to send emails internally amongst each other. If I respond to something that comes in, everything works fine. If I create a new email trying to send to someone internally, I get a bounce back message showing something relating to a First Administrative Group and I have no idea where I can go to correct this.
Can anyone help me out?