Hi Matt,
Here is the relevant info :)
Software Requirements-Cisco Unity Server Unity 5.x
Revised April 1, 2008
•A supported 32-bit version of Microsoft Windows Server 2003 or Windows 2000 Server:
-Windows Server 2003 R2 Enterprise Edition
Supported for all Domino, Exchange 2007, and Exchange 2003 configurations. When Exchange 2000 is the message store, supported only when an Exchange Server 2003 server is available to be the partner Exchange server.
-Windows Server 2003 R2 Standard Edition
Supported for all Domino, Exchange 2007, and Exchange 2003 configurations. When Exchange 2000 is the message store, supported only when an Exchange Server 2003 server is available to be the partner Exchange server.
-Windows Server 2003 Enterprise Edition
Supported for all Domino, Exchange 2007, and Exchange 2003 configurations. When Exchange 2000 is the message store, supported only when an Exchange Server 2003 server is available to be the partner Exchange server.
-Windows Server 2003 Standard Edition
Supported for all Domino, Exchange 2007, and Exchange 2003 configurations. When Exchange 2000 is the message store, supported only when an Exchange Server 2003 server is available to be the partner Exchange server.
-Windows 2000 Server
Supported only on selected servers. For more information, see the "Operating System" section of the Cisco Unity Supported Platforms List at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_data_sheets_list.html.
-Windows 2000 Advanced Server
Supported only on selected servers. For more information, see the "Operating System" section of the Cisco Unity Supported Platforms List at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_data_sheets_list.html.
From this good doc;
http://www.cisco.com/en/US/docs/voice_ip_comm/unity/5x/requirements/50cusysreq.html#wp532205
Hope this helps!
Rob
