IE 4.x needs service pack 2 because web pages with a 2-digit header year may not be cached and to fix some Java parsing problems. Y2K problems seem to be common in Java. Netscape itself needs no patches even for minor issues, but there are some problems in various versions of the Java Development Kits, usually with functions that obtain date representations. The latest versions of both Word and WordPerfect report no minor issues and are fully compliant. Email Clients Eudora, the most popular email program, reports no compliance problems.
Outlook reports one minor problem.
When receiving a message with a 2-digit date in the headers, it will be sorted out of order. Groupwise reports no Y2K problems for version 4.1 and up. If later versions of the client software, or if the DB8 post office is used, then the combination is compliant. Spreadsheet Programs Excel is fully compliant. The replacement of Windows 3.1 by later versions is almost complete.