Question : Outlook 2007 client prompts for password in exchange 2007 environment

we have a windows 2003 domain controller and separate windows 2003 mail server running exchange 2007 sp1. Having just completed installing a san/ucc cert and enabling forms based authentication for owa clients are being prompted for user name and password when they start outlook 2007. owa is working well and autodiscover test from outlook client passes all tests perfectly.  i have checked the "more" settings on the exchange email account and it is not set to ask for credentials.
any help would be gratefully appreciated.

Thanks

Answer : Outlook 2007 client prompts for password in exchange 2007 environment

In IIS do you have integrated windows authentication checked, as well as on the 2007 HUB server?