A large law firm, which has many employees, provides a single email address for each employee. Each employee’s email address is @lawfirm.com. However, the firm did not explicitly define the format of the login. Thus, some employees use their first names as their login names, some use their last names, some use their initials, etc. The firm now wishes to make a fixed format, for example:firstname.lastname@lawfirm.com, that can be used for the email addresses of all its employees. How can this be done without rocking the boat too much?