Formerly known as Microsoft Online (MSN China), Westwin is a marketing agency specializing in cross-border digital advertising/marketing solutions. In August 2016, Westwin acquired the majority business of Microsoft Online（MSN China）to better serve the unique China market.

As one of Microsoft’s core partners in China, Westwin focuses on driving business through Bing Ads. Westwin also inherited the branding and marketing consultancy business of Microsoft Advertising to help Chinese enterprises build brand globally. Apart from that, Westwin maintains partnerships with Baidu, Weibo and other Chinese digital platforms to offer one-stop digital marketing solutions to foreign businesses.