Along with iOS 8.1.1 and Apple TV 7.0.2, Apple released OS X Yosemite 10.10.1 on Monday. The update for the Mac operating system included fixes for WiFi reliability along with fixes for email-related issues.
OS X Yosemite 10.10.1 fixes WiFi issues, more
Apple's scant update notes list improved WiFi reliability, improved compatibility when connecting to Microsoft Exchange servers, improved Mail compatibility with email servers, and more reliable Back to My Mac connections.
OS X Yosemite is a free update weighing in at 311.8 MB. It's available for download through Apple's Mac App Store.