All of that tests OK, but OAB is still giving issues.ĮDIT for a while I thought it could be my certificate as I was seeing a chaining error when I would run sslchecker, but that seems to have sorted itself somehow (?) I did not initially have an external URL configured for autodiscover, but have since taken care of that, and the requesite listener and rules in ISA. My public name resolution is handled by my ISP and ISA directs everything to the Exchange server. That is to say my internal domain could be and my public. Internal namespace is seperate from public. Everything goes through an ISA 2006 server with a caching DNS configuration. All mailboxes are moved onto Exch07, public folders are replicated, OAB is on the Exch07. Server 2008R2 and Exchange 2007 SP3 coexisting with Exchange 2003 on Server 2003. When I run Test-OutlookWebServices I get errors 10 with The request failed with HTTP status 401: Unauthorized. When I run Test E-mail AutoConfiguration. Users with Outlook 2010 do not receive sync issues, but free/busy info is not available when scheduling meetings On my computer with Outlook 2007 I am getting 'Not downloading Offline address book files. I'm sure I have something missing or misconfigured, but can't determine what it could be.