Macs are likely to be the "key" to a high-performing fourth financial quarter from Apple, says Piper Jaffray. Previewing tomorrow's results call, the firm suggests that Apple will announce shipments of 2.8 million Macs, as evidenced by sales growth of 32 percent year-over-year for the combined months of July and August. Piper notes that this is further based on estimates of 23 percent growth yea
