If you use Apple’s Mac Mail app, and particularly if you are on more recent versions of OS X, such as Snow Leopard, Lion, and Mountain Lion, you may have found that the search function is not working properly (or, as you think it should) when you search for email within the Mac email program. It used to be that searching your Mac email archive was dead easy; now there are hundreds of threads in forums seeking help with Mac mail trouble shooting – many of them related to the search function. The Internet Patrol is happy to share with you the least well-documented feature of searching your Mac email archives. It is a game-changer, particularly if you have a huge body of email (as do we). Here it is: the Mac mail search function uses Boolean operators.