Users moved to #office365 Exchange Online but on-prem GAL affected
July 31, 2013 2 Comments
In a recently upgraded hybrid 2010/2013 environment with Single Sign On there can be a problem with the on-premises Global Address List.
Below is how the issue manifests itself for users and what can highlight the issue;
- As soon as a user is migrated to Office 365 it no longer exists in the on-premises GAL for on-premise users.
- GAL for the migrated user works fine, it shows both on-premises and O365 mailboxes.
Firstly it would be wise to check the following location in the Exchange Management Console – on-premise
The solution for this is to check for any instances of a ‘custom GAL’ – if this is the case then you will need to remove this custom instance as it doesn’t allow on-premise and Office365 to correctly populate the on-premise Global Address List.