KB ID 0000429
When trying to access Outlook Web App (or Outlook Web Access for those used to earlier versions of Exchange), you see a blank white page and nothing else.
This is usually due to an exchange pre-requisite that is missing, or one of them is not working.
1. Launch the Exchange Management Shell, (Start > All Programs > Microsoft Exchange Server 2010 > Exchange Management Shell).
2. Issue the following command.
3. Issue the following command.
4. Issue the following command.
5. Retry OWA.