Here’s a list of Cisco product documentation roadmaps for most Cisco UC applications.
Communications Manager:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_documentation_roadmaps_list.html
Unity Connection:
http://www.cisco.com/en/US/docs/voice_ip_comm/connection/9x/roadmap/9xcucdg.html
Contact Center Express:
http://www.cisco.com/en/US/products/sw/custcosw/ps1846/products_documentation_roadmaps_list.html
Instant Messaging & Presence:
http://www.cisco.com/en/US/products/ps6837/products_documentation_roadmaps_list.html
Emergency Responder:
http://www.cisco.com/en/US/products/sw/voicesw/ps842/tsd_products_support_series_home.html
Attendant Consoles:
www.cisco.com/en/US/products/ps7282/tsd_products_support_series_home.html