Act! Premium for Web v20.1 update 7 had issues arbitrarily kicking out users of the database.  This was solved rolling back to update 5 on the web server, but Outlook integration still had issues.

Our hosting partner found this update works for the local workstations.  Here is the user guide on how to configure the software.  It’s a best practice to uninstall the previous version of the integration tool before installing this.