Installed yesterday in my two "guinea pig" servers...

No issues so far

no issues so far but the annoying browser notification notifications are still present and cannot be disabled.

Roger - For the admin alerts, I dismissed them and they have not returned so far. I have not tested users.

Do you have issues with empty domains??

@Brian Bjerring-Jensen

No, al domains seems to be OK.

Kyle is on the matter and there is no way to get them going again. He has escalated it to development as urgent.

Hi Brian, 

Please update to Build 8644. We were able to identify what caused the null reference exception, and it should be corrected with your update. If you find that it's not, please take a backup of the domain copy. Then, in SmarterMail, detach the domain and re-attach it. Let me know how this goes!