Soft-Switch Inc, the Wayne, Pennsylvania company to which IBM Corp turned when the electronic mail portion of its office automation software development effort ran into trouble in 1988, has terminated its formal marketing relationship with IBM. The pact was established in 1989 under the IBM Co-operative Software Programme, and Soft-Switch says it has withdrawn because of a recent move by IBM to restructure the terms of the agreement to be more in tune with its strategic direction: unfortunately, Soft-Switch cannot take full advantage of the programme as it is now defined, the company says. It specialises in electronic mail network management and mail-enabled applications to add value to mail networks.