FWIW I encountered this today and I'm running Tbird 3.1.7
On 1/24/2011 9:23 AM, Jonathan L. Trigaux wrote:
> Mail certificates for imap.uvm.edu were updated yesterday. By
> reports, only versions of Thunderbird prior to 3.1 are complaining of
> the cert change. Clients can just click "Confirm," though I have had
> a few people need to restart the mail client afterward as well.