Could you try the steps in this article and let us know whether they work for you on Windows 10: Change the program used to open email links.

Often if you see a link coded to generate a new email message, right-clicking it will give you the option to copy the email address. On sites that assemble the link address using a script, the right-click option might be missing.

Thanks jscher! The link on your first post solved the problem. In response to your second post, right clicking didn't matter. But now it works since I used your fix. I'm surprised others are not having similar issues with Windows 10. Headache=gone.