Note: if you get an error stating that Enable-Organization Customization commandlet has not been run, execute it (without any parameters) and give it half an hour before reconnecting to Exchange Online and trying ABP routing operation again.
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We also need to enable Address Book Policy Routing in Exchange Online.
Also, and this is important, check to make sure that you have either an Enterprise (E) or an Educational (A) Office 365 subscription level.
Prior to Exchange 2013 being introduced, our 2007 URLs were configured as follows: The default internal URL and Auto Discover Service Internal URI values are derived from the server FQDN, but as you can see these have been changed. This also usually takes some host file manipulation to fully test.
Your configuration may be different depending on how it was setup. After all testing is complete…it’s time to update the Exchange 2012/2007 URLs.
But it is a somewhat new concept in Exchange Online and Office 365, and there isn’t a great deal of information on it out there yet.
Before we can jump into setting up GAL objects and policies, we need to grant ourselves permissions to manage address lists in Office 365 (this permission is not enabled by default).
Exchange 2007 does not support “Negotiate” authentication (See image below).
Therefore the external Client Authentication Methods should be configured to match whatever is configured for 2007, either Basic or NTLM.
2013 will proxy connections back to 2007 for legacy mailboxes.