We migrated away Exchange 2003 organization to Exchange 2010. The issue happens randomly to Outlook Client 2007 that its auto-discover keeps trying to connect to old exchange servers which already brought down! I don't manage Exchange Server, our Exchange Administrator stating that this is a known issue with Outlook Client 2007/2010 and nothing can be corrected! Personally, I think something can be done at Exchange Server setting or GPO! Unfortunately, I manage none of those areas. Please educate me the issue Outlook Client Auto-Discover randomly connect to old Exchagne Server and what can be done to correct them at either side, Server and Workstations. Thanks. Thang Mo

What service is trying to connect to Exchange 2007? I would guess that most likely you have some public folders with replicas still on the Exchange 2007 server. Another thing to check is that all your virtual server URLs are set to the correct server. See Set-ClientAccessServer -AutoDiscoverServiceExternalUri. Check Set-OutlookAnywhere -ExternalHostName. Also see the -ExternalUrl and -InternalUrl properties of Set-OwaVirtualDirecotry, Set-WebServicesVirtualDirectory, Set-AutodiscoverVirtualDirectory, Set-ActiveSyncVirtualDirectory, Set-EcpVirtualDirectory, and Set-OabVirtualDirectory. Get-ClientAccessServer | Set-ClientAccessServer -AutodiscoverServiceInternalUri https://webmail.contoso.com/Autodiscover/Autodiscover.xml Get-OwaVirtualDirectory | Set-OwaVirtualDirectory -InternalURL https://webmail.contoso.com/owa -ExternalURL https://webmail.contoso.com/owa Get-EcpVirtualDirectory | Set-EcpVirtualDirectory -InternalURL https://webmail.contoso.com/ECP -ExternalURL https://webmail.contoso.com/ECP Get-WebServicesVirtualDirectory | Set-WebServicesVirtualDirectory -InternalURL https://webmail.contoso.com/EWS/Exchange.asmx -ExternalURL https://webmail.contoso.com/EWS/Exchange.asmx -Force Get-AutodiscoverVirtualDirectory | Set-AutodiscoverVirtualDirectory -InternalURL https://webmail.contoso.com/Autodiscover/Autodiscover.xml -ExternalURL https://webmail.contoso.com/Autodiscover/Autodiscover.xml Get-OABVirtualDirectory | Set-OABVirtualDirectory -InternalUrl https://webmail.contoso.com/OAB -ExternalUrl https://webmail.contoso.com/OAB -RequireSSL:$True Get-AutodiscoverVirtualDirectory | Set-AutodiscoverVirtualDirectory -InternalURL https://autodiscover.contoso.com/Autodiscover/Autodiscover.xml -ExternalURL https://autodiscover.contoso.com/Autodiscover/Autodiscover.xml Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."