How to accept an exception for an "invalid security certificate"?

Created by Simon Schubert
Keywords:
certificate ssl
Last updated by:
Simon Schubert

Problem:
The Exchange Server offers an "invalid security certificate". This can be due to various reasons.
How do I tell Thunderbird to accept the certificate anyways; is there a way to pursuade thunderbird to accept the certificate?

Solution:
You can import the certificate into Thunderbird: <http://kb.mozillazine.org/Thunderbird_:_FAQs_:_Import_CA_Certificate>.