Sziasztok!It is a newly deployes SBS 2008 with most of the default settings. For a week or two I had had no problem, but today I just found one.Opening an Outlook 2007 client on a domain machine an authentication pop-up window is present and the 'Test E-mail AutoConfiguration' doesn't provide any result.On server in PS for Test-OutlookWebServices provides 'Found a valid AutoDiscover service connection point. The AutoDiscover URL on this object is https://sites/Autodiscover/autodiscover.xml. When contacting https://sites/Autodiscover/autodiscover.xml received the error The remote server returned an error: (401) Unauthorized. I set Anonymous Authentication to Enabled on Autodiscover virtual directory in IIS, than get (403) Forbidden when running Test-OutlookWebServices.Then turning Anonymous Authentication to Disbled and autodiscover is working fine. For some time. Than it becomes corrupted again.What shall be the problem here? Could You please help me? Csaba

Hi,For the Exchange 2007 associated with SBS 2008, please post it on the below link:https://connect.microsoft.com/sbs08/community/discussion/richui/default.aspx?wa=wsignin1.0ThanksAllen