FYI, this shows at the top of the forum:
Cisco Unified Communications Manager (CallManager) Frequently Asked Questions
I'm running version x. What do I need to do to get to version y and are there any "gotchas"?
https://supportforums.cisco.com/docs/DOC-13450#Im_running_version_x_What_do_I_need_to_do_to_get_to_version_y_and_are_there_any_gotchas
Cisco Unified Communications Manager (CallManager)
Install and Upgrade Guides
http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_installation_guides_list.html
Upgrading Cisco Unity Connection 7.x, 8.0, or 8.5 to the Shipping 8.0 or 8.5 Version
http://www.cisco.com/en/US/docs/voice_ip_comm/connection/8x/upgrade/guide/8xcucrug009.html
The upgrade procedure might differ depending on whether you're using the same HW, another MCS or going to UCS.
HTH
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate