Could not load type 'Microsoft.Exchange.Management.Security.AdfsFederationAuthModule'

After installing Exchange 2013 Beta, I got the following error when entering the new web based management console.

Could not load type 'Microsoft.Exchange.Management.Security.AdfsFederationAuthModule'.

  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

To resolve this I installed the following features:

-          Windows Identity Foundation 3.5

Do a IIS reset, and it should work.

WIF3.5 is a requirements for Exchange 2013, but is not installed as part as the installation. This might be a bug in the beta. The link below describes the requirements:
http://technet.microsoft.com/en-us/library/bb691354(v=exchg.150).aspx

Users unable to access Exchange Control Panel(ECP, OWA)

Today I troubleshooted an issue on Exchange 2010.
When the users clicked the Options button to access the Exchange Control Panel, the OWA page just reloaded and nothing happend.
Also when I tried to access the url for the ECP https://url/ECP I came to the OWA page.

One configuration change we did to remove the timezone and language prompt for our OWA users, was to set the defaultclientlanguage on the OWAVirtualdirectory.

When the OWAvirtualdirectory -defaultclientlanguage is set to something else than 0, this issue will occure.

I have now send a bug report to Microsoft, to find out if this is by design, or if its a bug.