You can have an unlimited number of users for each host. When you add a host to the server, you select the user database for the host: the WS_FTP Server internal database, Microsoft Windows, Ipswitch IMail Server, or an external ODBC user database.
If you selected the Microsoft Windows, Ipswitch IMail Server, or external (ODBC) user databases, you may already have a list of users for the host. In this case, you cannot use the WS_FTP Server Manager to add or delete users, but you can set additional user options in the Host Details page in the User Settings section.
If you are using a user database other than the WS_FTP Server internal database, you must use the other database's method to add or remove user.