Microsoft Corp returned to the rostrum in the person of vice-president Michael Brown, who reported that while Windows NT networking software is selling well, investors should be aware that it will not have a major financial impact in the near future: This is a strategic product and not a mainline driver of our financial results in the current fiscal year, Brown told the Montgomery Securities annual investment conference; Brown also said that Microsoft is working on improving Windows NT, which finally began shipping in August, but did not give a specific date on when the next release will appear.