Hi Abderrahim,
"Business Edition" is designed for Medium sized deployments. The Enterprise CCM version is fairly different. Here are some related docs for both;
Cisco Unified Communications Manager Business Edition is an easy-to-manage solution that combines voice, video, mobility, and messaging on a **single server to simplify system administration and reduce hardware and operating expenses. This solution provides cost-effective deployment options for medium-sized organizations with smaller IT staffs that require all the advanced capabilities of Cisco Unified Communications Manager (formerly Cisco Unified CallManager), Cisco Unity? Connection, Cisco Unified Mobility (formerly Cisco Unified MobilityManager), and integrated management on a single server to expedite migration to unified communications.
The solution includes many new capabilities designed specifically for medium-sized organizations.
From this doc;
Cisco Unified Communications Manager Business Edition
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6882/ps6884/prod_qas0900aecd805e69cf_ps7273_Products_Q_and_A_Item.html
Cisco Unified Communications Manager Business Edition Documentation Guide for Release 6.0(1)
http://www.cisco.com/en/US/docs/voice_ip_comm/cucmbe/docguide/6_0_1/dg601cr.html#wp1034252
Cisco Unified Communications Manager 6.0 is an enterprise IP telephony call-processing solution that is scalable, distributable, and highly available. Multiple Cisco Unified Communications Manager servers are clustered and managed as a single entity on an IP network, a distinctive capability in the industry that yields scalability of 1 to 30,000 IP phones per cluster, load balancing, and call-processing service redundancy. Cisco Unified Communications Manager 6.0 builds upon the feature set available today with Cisco Unified Communications Manager 5.1(1) and Cisco Unified CallManager 4.2(3).
From this doc;
http://www.cisco.com/en/US/customer/products/sw/voicesw/ps556/products_data_sheet0900aecd805e323f.html
Cisco Unified Communications Manager Documentation Guide for Release 6.0(1)
http://www.cisco.com/en/US/customer/docs/voice_ip_comm/cucm/docguide/6_0_1/dg601.html
Hope this helps!
Rob
