If you use Windows Server Update Services (WSUS) and turn on the If WSUS is in use, both Software Updater and WSUS install Microsoft updates setting, it allows Software Updater to override your WSUS settings and install software patches regardless of the WSUS settings.
If you use WSUS and turn this setting off, Software Updater does not install updates that are configured in WSUS (recommended in environments with actively managed WSUS). If you do not use WSUS, this setting has no effect.
Note: This settings does not apply to Microsoft Windows updates.
Important: If WSUS is used to automatically install updates and you turn this setting on, the client may try to update the settings from two sources. This may result in serious client-side update errors.