In the latest version of classic Outlook, users can't open encrypted emails. Microsoft confirms the issue and is investigating.

The problem happens for users who encrypt the email using the settings under the email File dialog (File > Encrypt), Microsoft further explained. To prevent the issue, there are two possible ...

Microsoft has confirmed a known issue that prevents recipients from opening encrypted emails in classic Outlook.

Selective Recovery Option: Select the specific mailbox folders that you want to recover, such as the Inbox or Sent Items.

Want to disable Copilot in Microsoft 365 apps? This guide describes how to disable Copilot in Word, Excel, PowerPoint, and ...

If you open MS Outlook and see an error message, Outlook is using an old copy of your Outlook data file (.ost), then use ...