Apple executives took the desktop wars to Microsoft's home ground, Seattle on Friday.

The Cupertino team, led by Apple senior director of Mac OS X Ken Bereskin, was in town to demonstrate Mac OS X to local technology reporters. Microsoft meanwhile was previewing its advertising campaign for its three-year old Windows XP operating system.

Now on the fourth release of OS X, Bereskin discussed Tiger's development aims: "We focused on things that we think will resonate extremely well with anybody who uses a computer - Mac users, people who are considering a Mac," he told Seattle Pi.

Assailed by security problems and a seeming perception as a veteran operating system, Microsoft plans to spend $200 million on marketing Windows XP.