The Exchange Server at the office of a customer is newly installed, including SP1. The owa never worked. We get the following error at the website:
[ArgumentException: Die Kultur mit der ID 4096 (0x1000) wird nicht unterstützt
(The culture id 4096 is not supported)
Since about 1 week we have a support call at microsoft, but they were not able to fix the problem. Until now we tried to reinstall the CAS-role and recreate the owa virtual directory.