If you are experiencing odd behavior with your email and have already tried troubleshooting with no success, Kerio suggested backing up the Outlook user files, then remove the email from Outlook, then re adding the user back.

The best way to install the Kerio Connect Assistant is to login into webmail (http://mail.(yourdomain)

Once logged in, click your name in the top right corner, then click Integrate with Mac/PC. Here is a link to using this process: