Exchange 2013 is supported.
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/9x/unified_messaging/guide/9xcucumgx/9xcucumg020.html#17832
- If you choose to allow Unity Connection to search for Exchange servers, then you need to select from the following two options:
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Exchange 2007 and/or 2010: Unity Connection can access every mailbox in the Exchange organization consisting of Exchange 2007, Exchange 2010, and Exchange 2013.
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Exchange 2003, 2007 and/or 2010: Unity Connection can access every mailbox in the Exchange organization consisting of Exchange 2003, Exchange 2007, and Exchange 2010. When the Exchange organization includes Exchange 2003 servers, Unity Connection always communicates directly with the Exchange back-end servers, it never communicates with Exchange front-end servers.
The drop down does not state 2013 but it will work fine for 2013..