Search engine privacy better results to that specific user and provide the user with a better searching experience. However, search engines can also abuse and compromise the privacy of the user's data by selling it to advertisers in order to gain profits. Users must decide what is more important to their search engine experience: relevance and speed of results or their privacy. The legal framework for protecting user privacy is not very solid. A few of the most popular search engines are Google, Yahoo, Bing, and Baidu, but many other search engines that are focused on privacy have cropped up recently, such as
Microsoft Search Server to extract the text of the file for full text indexing as well. The handlers and iFilters MSS uses are the same as used by SharePoint, Microsoft SQL Server and Windows Search as well. The data sources that are to be indexed are identified by their URIs and have to be configured prior to indexing. The indexer updates the search index as soon as an item is indexed ("continuous propagation") so that the items can be queried against even before the indexing crawl is complete. MSS can also federate searches to other search services (including SharePoint and web search servers)