Historical clue formulations

• Early online encyclopedia — 2020-02-23
• Microsoft's defunct digital encyclopedia — 2016-11-16
• Bygone online reference — 2016-02-07
• Onetime Microsoft encyclopedia — 2015-02-18
• Wikipedia precursor — 2013-07-12
• Former Web reference from Microsoft — 2010-10-18
• Something once bundled with Microsoft products — 2009-08-07
• Wikipedia alternative — 2008-08-15