Sybase SQL Server
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"Sybase SQL Server" was the name of Sybase Corporation's relational database product.
It was originally created for UNIX platforms in 1987. In 1988, SQL Server for OS/2 was codeveloped for the PC by Sybase, Microsoft, and Ashton-Tate. Ashton-Tate divested its interest and Microsoft became the lead partner after porting SQL Server to MS Windows NT.
Microsoft and Sybase sold and supported the product through version 4.21. In 1993 the codevelopment licensing agreement between Microsoft and Sybase ended and the companies parted ways.
In 1995, Sybase released SQL Server 11.0. Thereafter, it decided to better differentiate its product from Microsoft SQL Server by renaming it to Adaptive Server Enterprise in versions 11.5 and beyond.