I upgraded my lab CCM 5.1.2b to CCM6.0 (1a)
Both pub and sub are hosted on VMWare workstation 5.5.5. Worked fine with cm5.1.2b and processed the upgrade fine. I can access the admin pages etc. The 7970 phones reset and took the firmware update (SCCP70.8-3-S1). And that's all she wrote.