If a 13-in. Retina MacBook Pro does launch in the fourth quarter, the two Pros with high-resolution displays -- along with the reduced-priced MacBook Airs -- could put even more pressure on Windows PC OEMs (original equipment manufacturers) to up their game, cut prices or both.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , on or subscribe to . His email address is .

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in Computerworld's Macintosh Topic Center.