Apple has released the latest version of its Mac operation system.
OS X Mountain Lion makes it easier to share material to social networks and also introduces a notification panel similar to that found on many smartphones.
The news was revealed in the company's third quarter earnings release.
Mac sales were 2% up on the year, but the results fell short of many analysts' forecasts.
The firm's shares dropped about 5% in after hours trading on Wall Street.
Users trying to download the new software sometimes received error messages in the hours after its release.
These included owners of new Macs who had been given coupons to redeem "free" copies of the system, but were told "this code has already been used" when they tried to use them.
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