Borland International Inc and WordPerfect Corp are getting together to challenge the Microsoft Corp Microsoft Office with a bundle of their own, bringing together the Windows versions of the Wordperfect word processor, Paradox database and Quattro spreadsheet and offering it as Borland Office at a bargain basement $600 or less. The version of WordPerfect in Borland Office has been modified to work more closely with Paradox and Quattro and similar joint developments have been planned for the future, although privately-held Wordperfect Corp is not thought likely to sell out to Borland. WordPerfect is entirely owned by its top two executives, but is considering going public later this year or in 1994.