Oh please. People should know better than to use work email for personal stuff. This is a major corporation's work email. Not 'private correspondence.'

The whole idea that business email (and email in general) isn't already essentially public is a farce - the business itself has at will access to any employee's mails, and it can all be subpoena'd without warrant.

At best we should feel sorry for the employees not understanding this and treating their employer as a benevolent and trustworthy party.