Sooooo... Here's the problem
Two computers, a desktop and a laptop, both running Windows 8.1, both have all available updates installed, both are connected to the same home wireless network.
On my laptop, when I access my email in the Windows Mail app, under Settings > Account > Gmail (and Yahoo), it jumps to the bottom of the page under the section for the IMAP settings, where it says: "There's a problem with a server's security certificate." When I click "Details," it says "The certificate isn't from a trusted source. Malicious servers might use fake certificates that cause this error." That's it. No error code. It gives me the option to "Ignore certificate errors," which is "(not recommended)." It seems to be downloading the mail, though, so I'm not sure what's going on.
On my desktop with the same Windows account synced over both machines, same email account information, there is no error.
I've tried to Google this but I haven't turned up anything. Does anybody know what's going on here? Why are two machines with the same IMAP information disagreeing about the server certificate's authenticity? This is for both my Gmail and my Yahoo account, so I would think it must be Windows.
I've restarted the laptop twice to see if it would just go away, but no luck.