https://www.reuters.com/article/us-usa-trump-russia-microsoft/microsoft-looks-at-whether-russians-bought-u-s-ads-on-search-engine-idUSKBN1CE2K3

Microsoft Corp said on Monday it was looking into whether Russians bought U.S. election ads on its Bing search engine or on other Microsoft-owned products and platforms, after rival Google said it had discovered such ads on its products.