Hi,
I have started a phased migration to Hybrid Exchange/Office 365 and noticed a few problems. The main one is that when I move a mailbox from on-premises to Office 365, it completes OK and the user can access the mailbox from Outlook. However, they can only see the other users on Office 365, they cannot see the local Global Address List. Mail sent to local mailboxes fails saying the mailbox couldn't be found. It seems to only look at the Office 365 address list, not the on-premises one.
I'm using Centralized Mail Transport with Exchange Classic Hybrid Topology. For Azure AD I'm using Password Hash Sync and I've ticked the box for Exchange Hybrid Deployment Azure AD Connect.
Any ideas on what I might have missed?
Thanks,
Pat Rooney