New Delhi:21,April(STN) Ratan Tata the veteran has invested in a digital mailroom and logistics company (Mailit).The amount of investment has not revealed by both the group’s till now .The Mailit have said that they will open 500 digital mailroom a in India in coming 5 years .Mailit offers Courier service,Cargo,3pl,mailroom management and digital solutions to many companies running under Tata Group