Deal All, I really hope that someone can help on it   I would like, from a user name to get the corresponding e-mail address   the idea is to provide to my VI: domain name user name eventually the password if really necessary and get as result the e-mail address. In attachment you can see what I already try by using the .NET System.DirectoryServices.AccountManagement but unfortunately as result I get an empty string   If you have one alternative solution to query the Active Director