The problem happens for users who encrypt the email using the settings under the email File dialog (File > Encrypt), ...

Microsoft's recent update breaks the "Go to classic Outlook" button. Clicking on the button triggers a crash and keeps the new Outlook. Microsoft acknowledges the bug but offers a workaround to ...

Microsoft has confirmed a known issue that prevents recipients from opening encrypted emails in classic Outlook. Microsoft is investigating an Exchange Online service outage that is preventing ...