Try this

Open run dialog Windows+R

Type this exactly

Shell:appsfolder

And hit ok

This will open a explorer window

From the list of items select the mail icon

Then right click or application key or whatever way you do a right click

And from the menu select create shortcut

It will tell you cant create a shortcut here but do you want to create a desktop shortcut instead?

Choose yes

Then close the window and you are done