This article applies to:

Office 365

Exchange hybrid

PROBLEM:

Office 365 users don’t see on-premise dynamic distribution lists in their Outlook Address Book.

CAUSE:

Due to architectural differences in local Active Directory/Exchange  and Office 365, the on-premise Dynamic Distribution Groups do not get replicated to Office 365. This is by design.

WORKAROUND:

In Office 365 Exchange online administrative console create mail enabled contact that points to the dynamic distribution list in the on-premise environment.

To create a contact in Exchange Online to represent the dynamic distribution group, follow these steps:

1)      Login to Exchange Online admin console.

2)      Under Recipients/Contacts click on the Plus sign and select Mail Contact

Fill out the details. In the external e-mail address field enter the e-mail address of your on-premise dynamic distribution group. The change will be visible to clients after the next Offline Address Book rebuild (takes place once in 24 hours).

AFTER MIGRATION:

Once you have moved all your on-premise users you can remove this temporary solution and create equivalent Dynamic Distribution Groups in Exchange Online.

Dejan Foro