Thank you very much! Disabling the Sticky Notes zimlet fixes the problem here too!

We have the same problem with Zimbra 8.7.11 every day on many user accounts. Is there any way to fix this?

Yes! That seems to fix our problem. :-)

I have disabled popup/toaster notification in the defaultCOS now.

Thank you! :)

Since we have updated to Zimbra 8.5 our users are getting a pop-up window when a new mail arrive, that ask them if they want to allow a mail notification or not.This pop-up window looks like this:   In English this means something like "Do you want to update your notification aut...