Outlook certificate could not be verified [HELP]

[David Correia]

Hello i'm running Kolab2, and Outlook 2000 with Toltec connector.
I've installed the certificate, by copying the /kolab/etc/kolab/cert.pem
file, then rename it, in "cacert.cer" and then install by double clik.
But when i launch outlook, i still have the message:
" The server you are connected to is using a security certificate that
could not be verified...."
Must I paye to put my cert in a Trust Autority ? Or Is there any way to
avoid this message?

Thank you for help