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An email seen by the Herald appears to have been sent from a legitimate email address of an ACC employee.
It urges to click on a link to immediately migrate to a new Microsoft Office system so you can continue to access pay slips, the staff directory and email among other functions.
"All staffs/Outlook Users are expected to complete this process within 24 hours to avoid delay on mail delivery and to also enjoy the new outlook features.
"On behalf of IT Support. This is a group email account and it's been monitored 24/7, therefore, please do not ignore this notification, because it's very compulsory," the spam email said.
ACC said in a statement on its website that as soon as it was made aware of the emails, it took action to stop more being sent.
"We're confident no personal information was accessed, including contents of sent and received emails."
ACC said to contact CERT NZ to report a cyber security issue.