Issue: Outlook 2007 user gets logon prompt from outlook anywhere configuration
Synopsis: In an exchange 2010/2007 co-existence scenario, where Exchange 2010 is handling all requests to mail.domain.com, some outlook 2007 customers may get persistent prompts to login. Note that not all outlook 2007 users
Resolution/workaround: While in Outlook 2007, go to exchange proxy settings, and uncheck the checkbox (only connect to proxy servers that have this principal name in their certificate). download this document with the configuration All other settings remain the same
Ex-Shell 