vista logon using numeric username

Will Vista support logon using a numeric username? We would like to move to having our users logging on using an employee id number and not a typical username but when I attempt to logon using a numeric username, login fails.
Thanks.

Will Vista support logon using a numeric username? We would like to move to having our users logging on using an employee id number and not a typical username but when I attempt to logon using a numeric username, login fails.
Thanks.

Will Vista support logon using a numeric username? We would like to move to having our users logging on using an employee id number and not a typical username but when I attempt to logon using a numeric username, login fails.
Thanks.