Consider upgrading to PC DOS 2000. Some applications are listed below. Generally the first compliant version is listed, and previous versions should either be upgraded or patched. If the current version requires Y2K attention, more information is given. Adobe products are certified compliant if listed in the Adobe Year 2000 Product List.
Lotus suites appear to be compliant.
Mathematica is certified compliant. MS Access 97 8.0 is certified compliant. MS Excel 97 8.0 is certified compliant. MS Exchange 5.5 is certified compliant. MS FrontPage 98 is certified compliant.