Support Policy for Windows Automatic Update
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/prod_pre_installation_guide09186a008020a63e.html#wp64185
Windows Automatic Update (WAU) is supported on a Cisco Unity 4.0(x) server and on a Cisco Unity Bridge 2.1(x) or 3.0(x) server when the option Notify Me Before Downloading Any Updates and Notify Me Again Before Installing Them on My Computer is selected. (Note that if Cisco Unity Platform Configuration discs Revision 12 or later are used to configure the platform for the Cisco Unity or Bridge server, then WAU is disabled.)
H. M.