I just installed the Multisite plugin from a fresh WP install.
I followed instructions and everything went well, excepted when I can't to map a domain to a subdomain site. The Tools > Domain mapping is present in the Network dashboard, however after I created a subdomain and then entering the Dashboard of this subdomain, there is no Domain Mapping in the Tools menu.
I read lots of entries in this forum and elsewhere but as I can't find the solution, I posted my question here.
Thank you for your answer.