Updated from 9:14 a.m. EDT

Sun Microsystems

(SUNW) - Get Report

was down 4.3% in early trading after saying its first-quarter loss will be 5 to 7 cents a share, wider than analysts' expectations of a 4-cent loss. Revenue is now expected to be $2.7 billion to $2.9 billion, below estimates of $3.3 billion.

Sun also said it was reducing its workforce by 9% and consolidating its facilities, and will be taking a $500 million charge for the restructuring.

The company blamed a difficult business environment made worse by disruptions in the wake of the terrorist attacks on Sept. 11.

Other computer makers, including, most recently, Gateway (GTW) , have said the terrorist attacks hurt current quarter estimates.

An exception was Dell (DELL) - Get Report, which reaffirmed third-quarter estimates Thursday morning, saying business after the Sept. 11 attacks had rebounded better than anticipated.

Dell was down 4% in early trading, while Gateway was up 3%.