Gazelle (web browser) a predecessor project, "MashupOS", but with "Gazelle" the emphasis was on a more secure browser. By the July 2009 announcement of Google Chrome OS, Gazelle was seen as a possible alternative Microsoft architectural approach compared to Google's direction. That is, rather than the OS being reduced in role to that of a browser, the browser would be strengthened using OS principles. The "Gazelle" project became dormant, and "ServiceOS" arose as a replacement project also related to browser architectures. But by 2015, the SecureOS project was also dormant, after Microsoft decided that its new flagship browser would be Edge. Gazelle (web
Google Sidewiki Google Sidewiki Google Sidewiki was a web annotation tool from Google, launched in September 2009 and discontinued in December 2011. Sidewiki was a browser extension that allowed anyone logged into a Google Account to make and view comments about a given website in a sidebar. Despite the name, the tool was not a collaborative wiki, though the comments were editable by the author. Google used ranking algorithms to determine comment relevancy and usefulness, using criteria such as users voting up and down a comment, and past user contributions. Anyone could look up a contributor's Google profile and assess their credibility.