Netscape Communications Corp’s Navigator continues to command the high ground of the browser market with an 84% share, according to a study by market research firm Dataquest. However Microsoft Corp expects its user base to soar when agreements with America Online and CompuServe kick in mid-summer making its Explorer browser the default option for what it claims will be as many as 10 million users. Dataquest reveals that only 7% of net surfers are using Microsoft’s browser currently, but Redmond expects Netscape users will have added reason to switch to use Explorer now that Netscape is charging for new versions of Navigator.