How to determine RDP license useage in Server 2008

You can get access to the licensing details by going to Start -> Administrative Tools -> Remote Desktop Services -> Remote Desktop Licensing Manager. Click on the name of your server in the left panel and you will see the types and numbers of your licences listed. Clicking on each type in the left panel will give you more detail on how each type is allocated.

Alternatively, in the Server Manager, go to Roles -> Remote Desktop Services -> RD Session Host Configuration and then click on Licensing Diagnosis.

Once that has loaded, if you scroll to the bottom and find the Summary area, if you click on the name of the license server in the list, the details of your installed licenses will be shown underneath, including how many of each type of licence you have available.

Both the RD Session Host Configuration and Licensing roles must be installed.

duttcom: Using the first section of your comment doesn't work. That is what I was doing already where the Per User Cal Report option was disabled.

Using your second option the system shows 50 license installed and 50 available.  Does the server not track the licensing until after the initial 180 day grace period or something? I know this server has been accessed through more than a dozen different user accounts.

Okay, looking at the help file for the Remote Desktop Licensing Manager under "Track the issuance of Remote Desktop Services Per User Client Access Licenses" it states -

RDS Per User CAL tracking and reporting is supported only in domain-joined scenarios; that is, the Remote Desktop Session Host (RD Session Host) server and the license server must be members of a domain.

RDS Per User CAL tracking and reporting is not supported in workgroup mode.

Active Directory Domain Services (AD DS) is used for RDS Per User CAL tracking. The information about the RDS Per User CAL that has been issued to a user is stored as part of the user account in AD DS.

So it appears that your being unable to run the report is not an error as such because your server is not on a domain.

My server also shows all of my installed user CALS as being available. As long as you are not receiving the grace period warning in the Licensing Diagnosis Information panel and you have available licenses then you are okay.

so does this mean that the terminal server machine is not actually tracking any license usage?  The only reason to really purchase additional licensing is in case of a Microsoft audit?