Force Outlook to connect to Office365 instead of Exchange On-Premise
When we do a cutover migration, we encounter just after migrating all the content and configure the new profile in Microsoft Outlook, it autoconfigures itself directly with the On-Premise Exchange server.
Besides, if we make a ping to autodiscover.dominio.com, it will always resolve the local exchange server ip instead of the Office365 autodiscover, no matter if we add it to the hosts file, configure external DNS or even add the entry to the local DNS.
This is because Exchange 2010 presents the built-in functionality of autodiscover, and in order to the new profiles take effect of the new configuration needed, is necessary to do one of the two following steps:
1- Delete the Autodiscover virtual dir in IIS (at the local Exchange server):
- Run the Exchange Management Shell
- Execute the following commands
Remove-AutodiscoverVirtualDirectory -Identity «MyServer\autodiscover(autodiscover.contoso.com)»
Set-ClientAccessServer name -AutoDiscoverServiceInternalUri $null
- Restart IIS running «IISRESET» command inside a Command Line Console
2- Add the following registry entries on the client machine:
- Navigate to the path, if it´s Outlook 2007: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Autodiscover
- Navigate to the path, if it´s Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Autodiscover
- Add the following values:
«PreferLocalXML»
«ExcludeHttpRedirect»
«ExcludeHttpsAutodiscoverDomain»
«ExcludeHttpsRootDomain”
«ExcludeScpLookup»
«ExcludeSrvLookup»
«ExcludeSrvRecord»
«PreferLocalXML»=dword:0
«ExcludeHttpRedirect»=dword:0
«ExcludeHttpsAutodiscoverDomain»=dword:0
«ExcludeHttpsRootDomain»=dword:1
«ExcludeScpLookup»=dword:1 (forces Outlook to exclude SCP object check)
«ExcludeSrvLookup»=dword:1
«ExcludeSrvRecord»=dword:1
- Restart the machine and créate the new profile.
