When Borland eventually sold its Quattro Pro and Paradox products to Novell, where they would be joined with WordPerfect in an attempt to match Microsoft Office, Borland was left with InterBase, which Esber had purchased in the late 1980s and had its origins as a derivative of the RDB database work at DEC. Borland's ongoing strategy was to refocus its development tools on the corporate market with client–server applications, so Interbase fitted in as a low-end tool and a good generic SQL database for prototyping. This proved to be the longest lasting and most positive part of the Ashton-Tate acquisition, ironic since it was almost an oversight and little known to Borland until they acquired Ashton-Tate.