EWS Managed API : The specified folder could not be found in the store

Hi,

I have an application trying to access items in a folder in user mailboxes using EWS managed API 2.0. Mailboxes I am trying to access are on E2k7 and the service account I am using has full access to user mail boxes - I can open user mailboxes manually through Outlook. When I programmatically try to access the folders using EWS, I get the following error - 'the specified folder could not be found in the store'.