You can use the discussion and subscription features in most browsers, but you have more capabilities when you use Microsoft Internet Explorer 4.0 or later. If you're using an earlier version of Internet Explorer or another browser (such as Netscape Navigator version 3.0 or later) and you have access to a Web site based on SharePoint Team Services from Microsoft, use the Discuss a Document feature on the Discussion Boards page of your SharePoint team Web site to use the discussion and subscription features.
Most discussion and subscription features work when you use Office Server Extensions, available in Office 2000. However, the following discussion features require a server that is running SharePoint Team Services: