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

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

I have been moving from Google and Microsoft to Proton products. Proton's email and other products include encryption by default, and password-protecting messages adds a layer of security. However, I ...

Microsoft is looking into a newly identified issue in classic Outlook that prevents users from opening certain encrypted ...

Proton Mail finally has a native desktop app, rolling out now in beta for some users on Windows and MacOS. The encrypted email service has, of course, been available to desktop users since its ...

Secure email messages and attachments with encryption so that only the sender and intended recipient can view the contents. The Microsoft Outlook email program supports message encryption. You can ...