The most popular sites in all 'Regional' categories, according to the Alexa Toolbar. Updated daily.
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1.
Develops Internet search technology.
www.google.com
Site info for google.com 
2.
Indian version of this popular search engine. Search the whole web or only webpages from India. Interfaces offered in English, Hindi, Bengali, Telugu, Marathi and Tamil.
www.google.co.in
Site info for google.co.in 
3.
Official site. Find out about products and services, read company news, or check out job openings. Also offers product support, downloads, and learning tools.
www.microsoft.com
Site info for microsoft.com 
4.
The local version of this pre-eminent search engine, offering UK-specific pages as well as world results.
www.google.co.uk
Site info for google.co.uk 
5.
Amazon.com seeks to be Earth's most customer-centric company, where customers can find and discover anything they might want to buy online, and endeavors to offer its customers the lowest possible prices. Site has numerous personalization features and services including one-click buying, extensive customer and editorial product reviews, gift registries, gift certificates, wish lists, restaurant and movie listings, travel, and photo processing.
www.amazon.com
Site info for amazon.com 
See top sites in all 'Regional' categories