It marked the beginning of the end for QuarkXPress, which failed to innovate fast enough to compete with the integrated Adobe Suite. It also set the stage for Adobe’s eventual acquisition of Macromedia in 2005. Once Adobe acquired Flash and Dreamweaver, they were rolled into the "Web Premium" versions of later suites, effectively dominating the entire creative software market.
In 2003, Adobe did something radical: they bundled their individual heavyweights—Photoshop, Illustrator, InDesign, and GoLive—into a single "Creative Suite". Before CS1, buying professional design software was a fragmented, expensive nightmare. CS1 was the first time these tools started "talking" to each other through a unified interface.
Richard Black - Design and Marketing in Halifax, NS | LinkedIn
This release was critical in Adobe's push to replace QuarkXPress as the dominant desktop publishing program: