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The attack saw hackers exploit weaknesses in Microsoft Exchange email servers, with the federal government estimating 400,000 servers were compromised before the online assault and server vulnerabilities were revealed in March.
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“This activity put several thousand Canadian entities at risk — a risk that persists in some cases even when patches from Microsoft have been applied,” Foreign Affairs Minister Marc Garneau, Public Safety Minister Bill Blair and Defence Minister Harjit Sajjan said in the statement.