Hello guys, I'm wondering about using Force.com for publicly exposed web applications. I have gone through the documentation and I found out that every portal user should be managed as a standard user, so whenever authentication is required formal User treatment is required as well to cmply with the service license for every edition.

So having said this and not being able to address that from the Edition comparison charts:
How many authenticated users is a Force.com Site Site able to host?

Any input would be greatly appreciated.