If you are using Pidgin and MSN then most likely you saw a lot of "omega.contacts.msn.com" errors today. Luckily there is an easy fix for this issue.
- Get the latest certificate for omega.contacts.msn.com. You can do this by going to https://omega.contacts.msn.com in your favorite browser and download the certificate for the site (click on the certificate icon and choose save to file). Or you can simply use the attached file.
- Now you go to Tools->Certificates and remove the certificate for omega.contacts.msn.com.
- Import the saved certificate in the same dialog
Update
Due to a configuration error the certificate was not available for download. This is now fixed.