Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Thunderbird 1.0 email client bids to repeat Firefox success Hoping to emulate the success of the open source browser Firefox, the Mozilla group has now released version 1.0 of its Thunderbird email client.

Sci/Tech