I have a customer, that I installed a new server for (Windows Server 2008 R2). They currently have a SBS2008, that I want to decommission. And this is where it get's tricky. I found a guide how to do it, but and the final step, where I need to demote the SBS 2008, it fails. It says it can't contact a domain controller for the domain, even though the new server is GC and Domain Controller. I transferred all the FSMO roles from the SBS2008 to the new DC, as stated in the document, but when I turn off the SBS2008, nothing is working. So somehow the new DC is still depending on the SBS2008.
Any ideas would be much appreciated :-)