ADAM and IIS auth

A customer is considering using ADAM in conjunction with MOSS 2007. I have
adviced against it, but I'm not an ADAM expert. So I need to get this
hypothesis confirmed:

When authenticating against AD or a local machine account the worker process
of IIS will be passed security tokens for the user and for the groups of
which the user is a member. When using ADAM, this is not possible. Correct?

Specifically, we are going to use BASIC auth and nested security groups.

Any input on ADAM and IIS auth would be really helpful
/ Ted


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