Data protection firm Cybereason says Macs are now one of the most serious security threats in businesses and other enterprises. That statement will surprise a lot of people and anger some, but it shouldn't be rejected. In Short Circuits: It's been 20 years since Apple introduced the IMac, a computer that was so different from previous Apple computers that it nearly caused a user revolt, but it also set the stage for Apple's current successes. If you ever need to help friends fix problems with their computers, you'll want to check out Aero Admin. It's a screen sharing support tool with an amazingly capable free version. In Spare Parts (only on the website): The monthly Microsoft patches that were released this week correct 50 flaws, of which 17 are critical. • Malwarebytes has just released a version of their protective application for IOS devices.