just another thing...
Set up a reminder somewhere to renew the certificate... maybe one month before it expires so you have time to re-buy another one and nobody notice anything
. Well, I did this but unfortunatly I did so many time POSTPONE on outlook and one day people started to call me asking why there was a "certificate error". I have ordered a new cert but in some way the file was corrupted so I passed almost 5 hours answering questions about cert error. Finally when everything was resolved outlook give me a pop-up: REMINDER: Renew SSL Cert!
What a great day ^^