How is it clear exactly? Obviously they won't be trawling literally everything literally all the time, but being able to access anything they choose at any time they choose seems indistinguishable from the employee's perspective, and that is apparently allowed?
They can't access anything. They accessed his work work account because they thought it was the work account, and they had already asked him not to send personal stuff through the work account.
They didn't make any judgement about his personal account (which also got read) because as I understand it they've already ruled that you can't read personal accounts without very good reason.
