Mimecast, which provides email management systems, updates that the hacker was able to hack into the company’s systems and access customer information.

According to the company, the hacker was able to gain access to a certificate used to identify Mimecast services located on Microsoft’s server.

The company also states that all customers who may have been harmed have been updated and it also asks all customers of the company to replace the existing certificate in their possession with a new certificate issued by the company.

The breach was identified by Microsoft, which updated Mimecast that an unidentified source accessed the company’s servers.

According to DZNet:  Mimecast says hackers abused one of its certificates to access Microsoft accounts.

Mimecast, a provider of email management software, said learned of the security incident from Microsoft.

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