I often have a whole bunch of Outlook emails open and want to close them quickly.  This seems like a very basic task that almost anyone would want to accomplish without having to click the little box in the corner of the window.  After trying Esc, Ctrl-W and all the other standard ways that 99.99% of software developers use to do this taks I tried MS Outlook’s help.  Of course it was totally unhelpful and is always the case I found the solution on the website of a humanoid.

The keyboard shortcut to close open email windows in Outlook is ALT-F4.