How do you launch a Windows 10 app at startup?

Question

Some programs (for example, Outlook) you can launch at startup by creating a shortcut. You press Win+R, type in "shell:startup" to open the Startup folder, then you right-click Outlook, Open File Location, and right-click-and-drag to create a shortcut in the startup folder.

But with other apps (for example, Mail), it seems like you can't do that. (See another question).

So for apps like Mail, how can you make them launch automatically at startup?

Edit: An answer was found in the above referenced question. To create a shortcut for a Metro app like Mail, People, or Calendar, just drag it (normal left-click and drag). It works if you drag from Start Menu/All Apps, but does not work if you typed a search into the start menu. This works in Windows 10. I don't know if it works in Windows 8 or earlier.