Error 8100030d if I sign in with account different from @hotmail

My Windows Passport has a @libero.it email as userID.
When I try to connect from my office intranet, I cannot sign in with error
8100030d.
I have tryed other userID and I found out that only those that ends for
@hotmail.it or @hotmail.com can successfully sign in from office intranet.
When I am at home (same laptop), every userID works fine.
It seems that my office intranet cut off all the non-@xxxxxx users.
Because I think that there is not a security reason behind this (why only
@hotmail accounts?), I am wondering if there is a way to bypass this.
Can anyone help please?