Hi Kolawole,

Excellent question!

Cisco Unified Communications is the "Brand" name of the overall family of products which includes (I'm sure that this is not a complete list :);

IP Telephony - Communications Manager,Communications Manager Business Edition, Communications Manager Express and UC500

Voice Messaging - Unity, Unity Connection (part of Business Edition) and Unity Express

Video - Telepresence

Mobility - Cisco Unified Mobility

Conferencing - MeetingPlace and MeetingPlace Express

Applications

Presence - Cisco Unified Presence

Call Centre - Cisco Unified Contact Center

Unified Messaging is an enhanced, IP-based software solution that gives subscribers the ability to receive voice mail, e-mail, and fax messages in a single mailbox that can be accessed via the phone or from a desktop browser or e-mail client.

Cisco Unity Connection is a feature-rich voice and integrated messaging solution. It is referred to as "Integrated" rather than "Unified" because of the use of the IMAP client access to Voicemail messages on the email client.

CUCM-BE

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6882/ps6884/prod_qas0900aecd805e69cf_ps7273_Products_Q_and_A_Item.html

There are some good links here;

http://www.cisco.com/en/US/netsol/ns151/networking_solutions_unified_communications_home.html

Hope this helps!

Rob