How to enable the light version of OWA in Exchange 2013?
By default, the option to enable the light version of OWA is not exposed in OWA 2013.
It is easy enough to light up the option, if you want it for any reason.
Get-OWAVirtualDirectory | Set-OWAVirtualDirectory –LogonPageLightSelectionEnabled $true will do the trick. Run iisreset for the changes to take effect.
Sure enough, the option gets displayed.
Similarly you can enable the option to select whether the computer that is running OWA 2013 is a public or private one. This is not enabled by default in 2013.
Run Get-OWAVirtualDirectory | Set-OWAVirtualDirectory –LogonPagePublicPrivateSelectionEnabled $true followed by an IIS reset to enable the option.