Microsoft had previously predicted that 10% to 30% of its Upgrade Advantage customers would make the leap to the successor Software Assurance program when their UA deals ran out, but Goldman Sachs analyst Rick Sherlund predicts those numbers <A HREF="http://searchwin2000.techtarget.com/columnItem/0,294698,sid1_gci995214,00.html">will be more like 20% to 30%.</A>