I ran into a stupid problem, by changing the settings for permalinks to a WordPress (switching the classic PHP request to URL SEO) i get a “404 error page not found”. After checking that my apache to have the mod_rewrite enabled and .htaccess file was been created by WordPress itself, i tried to investigate into the configuration [...]

OWA, [outlook web access] is a webmail interface of Exchange server. Run on IIS server and for this and other reasons (you can find several worms and exploits warnings) is not a good idea to expose webmail and consequently the mail server, to Internet. Microsoft sell ISA [Internet Security Access] a firewall and proxy software. [...]