In an e-mail to directors after his dismissal, Mr Mistry said the group may face 1.18 trillion rupees (S$24.7 billion) in writedowns over time because of five unprofitable businesses. He cited Indian Hotels Co, Tata Motors Ltd.'s passenger-vehicle operations, Tata Steel's European business, and the group's power and telecommunications units as "legacy hotspots", according to the e-mail.