Hi Averett,
I don't see support for Arabic in either version;
Cisco Unified MeetingPlace 6.0
Multilanguage support-Provides voice prompt options for American English, British English, Japanese, French, French-Canadian, German, Portuguese (Brazil), and Spanish (Latin American)
http://www.cisco.com/en/US/products/sw/ps5664/ps5669/products_data_sheet0900aecd806030cf.html
Cisco Unified MeetingPlace Express 2.0
Multilanguage support for voice prompts: English (United States), English (United Kingdom), English (Australia), French (France), French (Canada), German, Japanese, Korean, Chinese (China), Chinese (Taiwan), Spanish (Latin America), Spanish (Spain), Italian, Dutch, Swedish, Russian, Danish, and Portuguese (Brazil) are supported.
http://www.cisco.com/en/US/products/ps6533/products_data_sheet0900aecd80622337.html
Hope this helps!
Rob