I came across this issue today with a client where all their Outlook clients were reporting that the server security certificate had expired.
Outlook errors with a notice of two out of three ticks like this image:
To fix this issue:
- Logon on to your SBS Server.
- Open the SBS Console
- Go to Network > Connectivity tab
- On the right-hand side, click on “Fix My Network”
- Run through the wizard, and it will detect the expired certificate and issue a new one.
The Official SBS Blog – TechNet Blogs http://bit.ly/GICfWd