We have local sites running on IIS in regular MS Windows network. User base has IE, FireFox and Chrome. Local sites are isolated by host headers and DNS record created for the common IP accordingly. This is a regular set-up.
Users without Yahoo Toolbar type http://intranet and the sites resolves. Users with Yahoo toolbar type http://intranet and the toolbar goes off to search for this site in public domain. This is irrespective to whether the address is typed into the browser address bar or the toolbar. All versions of toolbar and IE are affected.
I cannot see a setting on the toolbar to switch this "irritating" behaviour off and simply un-installing the toolbar is not an option.