If you run OCS Archive Viewer on IIS7 you can run into the following HTTP errors: 500.22, 500.23

Error: An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.

1. Open IIS, go to your Application Pools, find your Application Pool and double click the Managed PipeLine Mode.

2. Set the Manage Pipeline mode from Integrated to Classic.

You can also set the Manage pipeline mode in the Application Pool Defaults.

1. You can do this in IIS7 by clicking on Set Application Pool Defaults.

2. Change the Managed Pipeline Mode to Classic.

For more information: http://www.newguid.net/blog/post/2008/12/03/Run-webapplication-on-IIS7-(Vista)-in-classic-mode.aspx