There’s a theory being nurtured in certain quarters that Microsoft Corp’s Windows NT is less a strategic product for the company, more an emergency dike against encroaching Unix, and that Microsoft is trying to freeze the market long enough to bring on the object-oriented Cairo environment, its planned rival for whatever comes out of the IBM Corp-Apple Computer Inc Taligent Inc joint venture, and Sun Microsystems Inc Project Distributed Objects Everywhere. Others say no, that’s impossible. Cairo is too far away to be anything more than just a stake in the ground against IBM and Apple, while the hoopla surrounding Windows For Workgroups is meant to distract attention away from an ever later NT. Folks are now saying that the best bet for an NT rollout is May or more likely June, and other independent software vendor types are shaking their heads and betting that it will be September. How strategic will NT be anyway after Microsoft it moves NT stuff like memory management and multitasking into Windows 4.0 and MS-DOS 7?