The new operating system for Apple's Mac computers is now available free of charge, Apple has announced.
"The days of spending hundreds of dollars to get more out of your computer are over, " Craig Federighi, Apple Inc. Senior Vice President of Software Engineering told an audience at an Apple product event in San Francisco.
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The singer had been tweeting in support of migrants when she was bombarded with abusive messages.
Ministers are reportedly considering plans in a bid to lower inward migration.
In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".