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: Microsoft To Deliver New Windows System  #39;Longhorn #39; in 2006 Microsoft #39;s announcements about Longhorn marked the first concrete launch dates for Longhorn that Microsoft has provided. Industry observers have been estimating a release at the end of 2005 or beginning of 2006.

Sci/Tech