Apple's shares closed up nearly 10% on the announcement of "Boot Camp", a utility allowing Intel Mac users to dual boot with Windows XP.

Analysts reacted very positively on the announcement of Boot Camp. Piper Jaffray UBS and American Technology Research believe that this move will help Apple to gain market share over its competitors.

- Gene Munster (Piper Jaffray): "We believe Apple will gain share in the PC market in CY06 and Boot Camp may serve to accelerate these market share gains."

- Ben Reitzes (UBS): "With 'Boot Camp' on Leopard, we believe AAPL could benefit from a significant OS upgrade cycle starting in its December quarter."

- Shaw Wu (American Technology Research): "Boot Camp potentially could be a significant game changer. We believe a key reason why Apple has not gotten more 'switchers' is lack of strong Windows compatibility."

The stock closed at $67.27 up $6.04 or 9.87% (from $61.17). It is now trading at 67.15 in the after hours session.

Apple investors' discussion here