Msiexec /qr /i Sophosoutlookaddinsetup.msi T=1 Ec=3 C=1 I=1 |best| -

t=1 , ec=3 , c=1 , i=1 : These appear to be public properties being passed to the MSI installer. The meanings can vary depending on the specific MSI package and what properties it supports. Generally:

@echo off msiexec /qn /i sophosoutlookaddinsetup.msi t=1 ec=3 c=1 i=1 /l*v C:\install.log msiexec /qr /i sophosoutlookaddinsetup.msi t=1 ec=3 c=1 i=1

To troubleshoot or verify success, add logging: t=1 , ec=3 , c=1 , i=1 :

This command is primarily utilized in environments using Group Policy Objects (GPOs) or through endpoint management tools like SCCM or PDQ Deploy . Likely sets the or Encoding level for communication

Likely sets the or Encoding level for communication with the Sophos Gateway. C=1

Usually instructs the add-in to integrate directly into the Outlook or "Insert" menu immediately upon the next launch. Why use this?

This command is the "secret handshake" used by IT administrators to deploy the across an entire organization without touching every single computer. It tells the Windows Installer exactly how to behave and which features to turn on during the setup. The Command Breakdown