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I like to answer every mail I get within twenty-four hours, even if it means getting up at 4 a.m. to check my mailbox. I truly believe that if someone has taken the trouble to write to you, they deserve to know that you have read what they had to say, and responded to. It does not matter if that someone is a young TCSer who wishes to share a thought with the CEO, or a Harvard professor; they both deserve a timely response.
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S. Ramadorai (The TCS Story ...and Beyond)