Tried installing the Notes client on several laptops and desktops and I get an error message that says Modular Messaging Client Add-in for Microsoft Outlook is installed on this system. Please uninstall the software to continue with this set up. We do not use MS Outlook, just Lotus Notes and we are just testing the Modular Messaging on several stations before we roll it out. I cannot find any MS Outlook software to uninstall. Any one have any ideas? Also, it is not happening every time. I successfully installed the client on 5 machines, and have got the error message on 5 other machines.