We've recently migrated over from SBS 2003 to SBS 2008. We have 5 domain-joined PC's running Outlook 2007 - these are working fine.
However, we have one laptop that in not joined to the domain (Home O/S) - this laptop is unable to download the Offline Address Book, nor set Out Of Office. I'm convinced that this is to do with the Autodiscover feature as if the Outlook Autoconfiguration test fails with "unable to determine settings".
Also, if I try to browse to the autodiscover URL (https://remote.domain.com/autodiscover/autodiscover.xml) I am prompted for a user name and password. This doesnt happen from a domain-joined PC. Once the creditials are entered the XML data is displayed correctly.
I've carried out lots of google research but have now hit a dead end - I'm hoping that someone may have experience of this issue and offer a solution!