How to output claim-based authentication userID to IIS log(cs-username)

Hi experts,

I am investigating how to output the authenticated userID to IIS log(cs-username)

when using the type of claim-based authentication.

We are trying the following two ways, but both of them do not work.

(1)   ISAPI filter (Native C++)

We cannot get the authenticated user ID.

Of course, we can output the userID to the IIS log(cs-username).

(2)   HTTP Module (.NET C#)

We can get the authenticated userID.

However, we cannot output the userID to the IIS log.

I am using IIS 7.5 (Classic Mode). I cannot use Integrated Mode because thie is the requirement for Dynamics CRM 2011.

If you have some useful technical information, please provide to us.

Thank you in advance.