In a statement issued to CNN by e-mail, an Apple spokeswoman said the company's existing data centers will not use coal energy by early next year.

CNN: Apple's green image continues to be dirtied

When contacted by the Mail yesterday, Ellory issued an apology.

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The e-mail was obtained by the BBC, and was issued by internal communications at the Ulster Bank.

BBC: Ulster Bank staff get strike security advice

Royal Mail and the Social Security Agency have issued advice to customers affected by the dispute.

BBC: NEWS | UK | Northern Ireland | Union offer to restart mail talks

Last month the U.K.'s National Infrastructure Security Co-ordination Centre issued a major call for vigilance, noting 17 targeted Trojan horse attacks sent by e-mail that "appear to be covert gathering and transmitting of commercially or economically valuable information" from British companies and the government.

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