Hello All... Customer is getting the above message every time they open outlook... I checked their server which is SBS and noticed the certificate is expired... However it is not self assigned so I am not sure what to do... I cant seem to just renew it? It has never been setup with an SSL certificate from the outside and has been working fine for the last 3 years.... Should I purchase an outside SSL? Is there any quick instructions on what I should do? Remember everything resides on 1 server as it is small business server. Any help would be great as I believe they are currently receiving email but getting complaints of customers not receiving their replies!