Officially we only support this:
Table 2 Supported Version Combinations on Workstation to Access Voice Messages by Using the Cisco Unity Connection Web Inbox
http://www.cisco.com/en/US/docs/voice_ip_comm/connection/compatibility/matrix/cucclientmtx.html#wp107011
HTH
java
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate