Hi Alsayed,

Just to add a note to the great tips from Jonathan

Hereis a doc (attached) called "Selling Cisco Unified CommunicationsExpress". It gives a feature comparison between CME 4.0 and CCM 4 and5, as well as compares CUE to Unity and Unity Connection.This is an "older" doc but should still give you a baseline for the differences between CUCM and CME.

As for the other part of your enquiry;

CUCM-BE is a single server "all in one" platform.

Cisco Unified Communications Manager has the unique ability to cluster multiple servers and manage them as a single entity, allowing customers and constituents to optimize reliability and scalability. Additionally, Cisco Unified Communications Manager comes with a host of innovative and robust features, including integration with Microsoft Outlook address books for simplified dialing, analysis, and reporting tools for detailed call records, a receptionist console, and conference calling.

***Cisco Unified Communications Manager Business Edition is a single-server system that includes unified messaging services with Cisco Unity Connection, call-processing services with Cisco Unified Communications Manager, and mobility services with Cisco Unified Mobility. This solution is suitable for medium-sized organizations consisting of between 200 and 500 users.

Hope this helps!

Rob