Create MAPI virutal directory in separate website

Hi,

is it possible to create the MAPI virtual directory in a website other than the 'Default Web Site'. I want to have to separate MAPI virtual directories. One for accessing from the internal network (using NTLM) and one for accessing from the internet (using basic authentication). The OWA, ECP and ActiveSync cmdlets have the option to specify the website the vdir is created under, but the new-mapivirtualdirectory doesn't have this option.

Thank!

Frank.