In 2000 BT then went searching for another alliance, and created a new Concert alliance between BT and AT&T, moving the headquarters to Atlanta, Georgia. This alliance did not help the negotiations between BT and MCI WorldCom as their partners from MCI and AT&T were corporate enemies. For Tymnet, the data network portion of the split, and the "CPS Leonardo" project, the split was never fully realized. Instead, MCI WorldCom completed their migration of services from Tymnet to IP based services in March 2003 and disconnected their supervisor nodes and their portion of the network on March 31, 2003.
