Configuration Manager 2007 R3 Beta

The released Configuration Manager 2007 R3 Beta is an eval version, it can only apply to eval version of Configuration Manager. If you try to install it to a full installation of Configuration Manager, the installation will failed (refer to the captured screenshots below).

*This obviously left you no choice, if you really want to test out R3, you need Configuration Manager 2007 SP2 eval version or Configuration Manager 2007 SP2 with Configuration Manager 2007 R2 eval version.

WDS services unable to start

The WDS services is unable to start and caused OSD failure. This might caused by the configmgr PXE service point. Follow the guide below to remove and re-add the PXE service point might fix the problem.

*Before begin, please make sure that there is no package binding with the SMSPXEIMAGE$  (such as Boot Images).

1. Delete the configmgr PXE service point. Check the PXESetup.log and make sure it uninstalls successfully.
2. Delete the WDS role and reboot the machine.
3. Once rebooted, re-install the WDS role. Reboot the machine after the installation finished. DO NOT CONFIGURE ANYTHING ON THE WDS!
4. Once the machine restarted, add the configmgr PXE service point in the ConfigMgr console. Check the PXESetup.log and make sure that the installation successful. 
5. Remember to re-add the Boot Images to SMSPXEIMAGE$ Distribution Point that you had removed earlier.

You may want to have a look on reference below,
http://blogs.technet.com/smsandmom/archive/2008/09/17/configmgr-2007-troubleshooting-pxe-service-point-issues-and-wds-service-not-starting.aspx

DC Status shows Unavailable

The DC status of Windows Server 2008 shows unavailable while transfering the FSMO to new DC during the transitioning process. This is due to TCPIP V6 components issue, even though the IPV6 bindings on the NICs had been disabled. The components can be disable by editing the registry.

Step by Step to disable IPV6 components.

I'm using the value "0xffffffff" for my case.

Rebuild Trust | After Transitioning

After the transitioning process finished from windows server 2003 to windows server 2008, the trusts with others DC is still there. But those trusts aren't working anymore, and hence need to remove it and rebuild the trust with others DC.