Mac OS X has hit the ground running, achieving $19 million in sales a week after its March 24 launch.

This figure only accounts for sales in the last week of Apple's second quarter, which ended March 31, 2001.

The revelation was made by Fred Anderson, Apple's chief financial officer, after Apple's second-quarter financial announcement yesterday, in which the company announced a profit of $40 million.

About a third of the $19 million sales were made through Apple's online store. The number of units shifted has not yet been disclosed.

Anderson said that sales for the £85 Mac OS X were strong worldwide. David Millar, Apple UK's public relations manager, said: "Mac OS X sales in the UK remain strong, but we will not be able to release figures."