Will I require a new Keycode file to set up my version 10 licence server?
Yes, you will require a new concurrent licence file for ArcGIS 10. You will no longer need to request a licence file based on a hardware key or MAC address. At version 10, Concurrent licences will utilise various machine identifiers to establish Trusted Storage for the host server on which the Licence Manager is installed. This technology means the Sentinel key (dongle) is now obsolete (ESRI is not requesting the return of existing hardware keys). Yes, you will receive a new ArcGIS v10 authorisation number to use during the authorisation process of the software.