A declaration in a long-running lawsuit between SCO Group Inc. and International Business Machines Corp. raises new questions about whether Microsoft Corp. or some of its executives indirectly assisted SCO's legal front against the Linux operating system. In the sworn statement, the founder of investment firm BayStar Capital Management LLC -- which invested $50 million in SCO -- testified that he made the investment after several Microsoft executives had said their company would guarantee BayStar's investment in some way. A Microsoft spokesman says no guarantee was ever provided.