I have been looking for some data sheets on Cisco.com in regards to upgrading a existing CCM 4.2(3) to CUCM 7. Specifically I'm looking to find out if the IBM x346 series server will support CUCM 7.
I have found this link but it doesn't state if it supports version 7.
Have a look at Table 3 in this good doc :)
Cisco Unified Communications Manager Server Support Matrix
Hope this helps!