SBS 2003 Exchange and Exchange 2007 - migration, decomissioning, GC and DC Roles

Let me provide the background:
Single SBS 2003 Server running Exchange, F&P, DC, AD, DNS, DHCP etc.

1 x new HP Server purchased running Windows Server 2008 64 BIT, Exchange 2007, DC, GC, DHCP, DNS, Active Directory etc.

FSMO roles have been transferred and a number of other items have taken place in the background.

The problem is two fold:
First, on the Windows Server 2008 box, under Exchange, under Server Configuration, Properties of Server Name, Systems Settings Tab : It is showing that the old SBS2003 DC which is still active and plugged into the network is the active domain controller that the Exchange 2007 server is using.

It should be instead showing me the Windows Server 2008 box itself as being the active domain controller in use, I need to somehow manually change this to ensure the Windows Server 2008 box is used for Domain controller services.

I also understand this should happen automatically after a 30 minute timeout of the SBS 2003 box being pulled off the network but this has not happened.

The second problem is similar, under it shows there are NO Global Catalog servers being used by Exchange 2007. It used to show that the SBS Server 2003 was the GC being used but then I modified the Reciepent Update config in Exchange 2007 to look directly at the Windows Server 2008 Box GC.

Any ideas, problem is urgent.