Microsoft first delivered Encarta on CD-ROM in 1993 as part of the early wave of multimedia products for PCs, before adding a website as well. In response to criticism against Wikipedia's dubious veracity, Microsoft sought credibility by acquiring other encyclopedias, including Collier's Encyclopedia and New Merit Scholar's Encyclopedia. The company had tried to buy Encyclopedia Britannica but was rebuffed.
Encarta just could not keep up with Wikipedia and fell totally behind. User changes and updates were enabled in 2006, but only after Encarta staff approved them. The result? Encarta Premium, the high-end product, boasted 62,000 articles compared to Wikipedia's 1 million-plus. In March 2009, Microsoft announced it was discontinuing both the Encarta disc and online versions.