I have a very simple MSI distribution for a Microsoft Outlook Add-On (the Add-On is for our email archiving service). The MSI itself is very small and installs perfectly under LocalSystem. The only time I get a failure is if Outlook is open. Is there any way to formulate my distribution so that it could test for the OUTLOOK.EXE process and, if present, delay the installation. Or even better, ONLY install the application if nobody is logged into the computer.