Why all of the sudden am I getting certificate errors when using internet explorer?

There is a problem with this website's security certificate.

This organization's certificate has been revoked.

Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server.

We recommend that you close this webpage and do not continue to this website.

Click here to close this webpage.

Continue to this website (not recommended).

More information

If you arrived at this page by clicking a link, check the website address in the address bar to be sure that it is the address you were expecting.

When going to a website with an address such as https://example.com, try adding the 'www' to the address, https://www.example.com.

If you choose to ignore this error and continue, do not enter private information into the website.

For more information, see "Certificate Errors" in Internet Explorer Help.

Why all of the sudden am I getting certificate errors when using internet explorer?windows live messenger

What you are seeing is not uncommon (or, at least, not as uncommon as it should be). As companies change, reorganize, rebrand, and merge, sometimes certificates go bad. I would suspect that you are just now seeing the problem either because the certificate has just been revoked or because some update you have made to IE has set the "check certificate" option to always make the check.

If I know the site and it was just a matter of the name on the certificate did not match the website, I would not have a problem. Expired certificates also show up and I don't worry that much about them if I know who I'm dealing with. Both of these are often innocent.

On the other hand, having a certificate revoked does not sound normal. I would hesitate to use that site without researching the company a bit more.