Microsoft Corp is breaking the habit of a lifetime to exhibit at the UniForum Unix trade show in San Francisco March 15 and 19: its Windows NT group has signed up for a 20 foot by 20 foot stand, claiming it doesn’t have the budget for a bigger space; meanwhile, UniForum – the US Unix user group – has scheduled an executive session for Friday March 19 with Roel Pieper of Unix System Laboratories Inc, David Tory of the Open Software Foundation and Paul Maritz of Microsoft Corp speaking for 10 minutes apiece then opening the floor to an hour’s worth of questions and answers.