We recently removed a license, and changed a password for a person who left our company. After the license was removed we had the mailbox set to forward messages to the person's manager. It was brought to our attention that he was still able to send/receive emails on his phone. We then converted him into a shared mailbox, which I know doesn't need a license, and deleted the person completely. Did him having the email on his phone somehow allow him to still use it even after all of that? We are just wondering what is going on a why, to prevent this in the future.