When launching OWA 2010 in Exchange 2010 you see the error Outlook Web App didn’t initialize. If the problem continues, please contact your helpdesk.
Couldn’t find a base theme (folder name=base) . This can be fixed with a power shell command
If you want to send emails on behalf of other people then we need to setup the send as and send on behalf permissions in microsft exchange 2010 or exchange 2007. Here is a step by step guide on how to do so.