Reader Eric Lowe has a problem with Mail in OS X: My email opens at reduced size, but the expansion icon is grayed out, so I cannot get the page to full-screen size. With Mail set to full screen, mail ...

Look at this button in the top-right corner of a Finder window. Ever wondered what this is for? It’s called the “toolbar control button” and you’ll see it all over the place in OS X. It lives in the ...