Passage: Gmail is a web-based email service, launched in a limited beta release in April 2004. With over 1 billion active consumer users worldwide in February 2016, it has become popular for giving users large amounts of storage space, and for having threaded conversations and robust search capabilities.As part of G Suite, Gmail comes with additional features designed for business use, including:

Question: When was the earliest version of Gmail released?
April 2004