This update fixes Wi-Fi issues with Yosemite, as well as connections with Microsoft Exchange servers. In addition to security bug fixes, Yosemite 10.10.1 includes stability enhancements and addresses Wi-Fi reliability issues, as described by Joseph Keller over at iMore: This update is available for OS X Yosemite 10.10. The update for the Mac operating system patches four security flaws altogether, addressing privacy flaws and a vulnerability related to arbitrary code execution. This week, along with iOS 8.1.1 and Apple TV 7.0.2, Apple released OS X Yosemite 10.10.1 offering stability enhancements, security updates, and other bug fixes. Apple + Security News OS X Yosemite 10.10.1 Update Patches Four Flaws
