Microsoft Corp. today released software updates to plug four critical security holes that attackers have been using to plunder email communications at companies that use its Exchange Server products. The company says all four flaws are being actively exploited as part of a complex attack chain deplo...

Microsoft on Tuesday issued a bevy of patches to correct at least 70 distinct security vulnerabilities in Windows and software designed to interact with various flavors of the operating system. This month’s patch batch tackles some notable threats to enterprises — including multiple flaw...