VMware Version 5.0 is supported with ACS 5.3:
http://www.cisco.com/en/US/docs/net_mgmt/cisco_secure_access_control_system/5.3/installation/guide/csacs_vmware.html#wp1069964
http://www.cisco.com/en/US/docs/net_mgmt/cisco_secure_access_control_system/5.3/release/notes/acs_53_rn.html#wp222007
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