Hello Mohamed.
I believe you ask about "Agent Inbound Email" versus "Cisco Unified E-mail Interaction Manager" ??
Agent Inbound Email is a build in functinality in UCCX7.0(1)SR01 PREMIUM licensed, which routes specific email aliases to UCCX agents which have skills to an E-mail.CSQ in UCCX. It's a very simple way of routing emails to UCCX agents.
Cisco Unified E-mail Interaction Manager (CIM) is a 3rd party product with a Cisco label on. It integrates to UCCX and UCCE.
It's a very complex product with tons of settings.
Check link for further information.
http://www.cisco.com/en/US/products/ps7236/products_data_sheet0900aecd805e208d.html