What folder are you likely to find email messages for an outlook user in windows

$1.$ C:$\backslash$Windows$/$system$32\backslash$Microsoft$\backslash$Outlook

$2.$ C:$\backslash$Windows$/$system$32\backslash$AppData$\backslash$Local$\backslash$Microsoft$\backslash$Outlook

$3.$ C:$\backslash$Users$\backslash$$USER$$\backslash$ AppData$\backslash$Local$\backslash$Microsoft$\backslash$Outlook

$4.$ C:$\backslash$Users$\backslash$$USER$$\backslash$Microsoft$\backslash$Outlook