Microsoft Bookshelf was a reference collection introduced in 1987 as part of Microsoft's extensive work in promoting CD-ROM technology as a distribution medium for electronic publishing. The original MS-DOS version showcased the massive storage capacity of CD-ROM technology, and was accessed while the user was using one of 13 different word processor programs that Bookshelf supported.

Bookshelf 1.0 used a proprietary hypertext engine that Microsoft acquired when it bought the company Cytation in 1986.

The original 1987 edition contained The Original Roget's Thesaurus of English Words and Phrases, The American Heritage Dictionary of the English Language, World Almanac and Book of Facts, Bartlett's Familiar Quotations, The Chicago Manual of Style (13th Edition), the U.S. ZIP Code Directory, Houghton Mifflin Usage Alert, Houghton Mifflin Spelling Verifier and Corrector, Business Information Sources, and Forms and Letters.[1] Titles in non-US versions of Bookshelf were different.

BYTE in 1989 listed Microsoft Bookshelf as among the "Excellence" winners of the BYTE Awards, stating that it "is the first substantial application of CD-ROM technology" and "a harbinger of personal library systems to come".

https://en.wikipedia.org/wiki/Microsoft_Bookshelf