Exchange 2010 SP2 brings a lightweight browser based client, called OWA (Outlook Web App) Mini and is designed to be used in mobile phones. It is pretty much like the OMA in Exchange 2003. You can access the OWA Mini by appending /oma at the end of your OWA url. For example, my OWA url [...]
While upgrading to Exchange 2010 SP2 using the GUI, you will come across the error message shown below. This only happens while upgrading the CAS role.