Hi Johnny - that still didn't work. The full error message is as follows: Unable to establish a secure connection to st11-p00-impap.mail.me.com.akadns.net because the correct root certificate is not installed.
What can I do next?
Date and time is correct. I've unchecked and rechecked Mail, still the problem persists.
I haven't deleted the mail account in Mail, because the problem is in Entourage, so I'm confused as to why I need to delete and reset my Mail account?
I've been on to the Apple support page and it says the *mail-me.com is a blocked certificate. Could this be the issue?
I deleted my account in Mail, restarted my Mac, set up the account again, went into Entourage and the error message still came up!