They are helpful; you don't need to type your contact data each time you form an email. In any case, not simply that, a decent email signature makes you look very expert.
Yet, your email mark should keep awake to date for it to really mirror your polished skill. Regardless of whether your contact data has changed or you have a new position title, you shouldn't disregard your mark. Luckily, it's terribly advantageous to change your mark in Outlook, regardless of whether you utilize the work area or the web application.