Looks like the planned May update is being rolled out, version 7.0.7392.0. This update addresses the fraudulent third-party digital certificates that could lead to potential phishing attacks or intercept web browser connections (man-in-the-middle). The update simply moves these certificates into the "Untrusted Publishers" certificate storage on your device.
More information on the update is available over on the update history page. Have you received the update notification yet?
Updated: According to Microsoft, this update is at the discretion of carriers, again, meaning some of us may not see this until it is tied with another, future update: "How you get 7392 depends on your mobile operator and what updates you’ve installed...If you’ve already installed the March update, you’ll receive 7392 as a standalone download or bundled with a future update."
Source: Microsoft Windows Phone; via WPSauce
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Rich Edmonds was formerly a Senior Editor of PC hardware at Windows Central, covering everything related to PC components and NAS. He's been involved in technology for more than a decade and knows a thing or two about the magic inside a PC chassis. You can follow him on Twitter at @RichEdmonds.