FYI,
I have had a number of issues with the free Apple program called Bonjour. Bonjour is optionally included with iTunes and other Apple products. In some configurations of Windows 7 it has been causing network interruption by adding 0.0.0.0 as the default gateway. Additionally it will cause 2012 srv errors on your Windows servers. It cannot cause stoppage of the servers but if you are scratching your head trying to figure out where these are coming from you now have the source. This is most irritating because you will spend time updating drivers, etc. and make no headway with it. Some copiers and printers now have this included with them. I recommend you shut this off! Setup the Windows firewall on your servers and block UDP port 5353 and do not let the mDNSResponder service run on Windows 7 machines.
