Office 365 – Distribution List Migration Version 2.0 – Part 18

New handling of recipient restrictions assigned to the migrated distribution group.

There are several restriction types that can exist on a distribution or Office 365 group. These restrictions include attributes such as accept messages from senders or members, reject messages from senders or members, or bypass moderation from senders or members amongst others. The utilization of these attribute are not restricted to just distribution groups. For example, mailboxes may have accept or reject message restrictions applied to them and these restrictions may be based on a group.

 

I recently worked with a customer who had provisioned conference room mailboxes directly in Office 365. They choose to restrict who could book the conference room by establishing accept messages only from restrictions on the conference room mailbox. They established the restriction using a distribution group and would subsequently add and remove members as necessary to allow or block the booking of the conference room. Here is an example of sample restriction:

 

PS C:\Users\timmcmic> Get-Mailbox 9f888d86-da1e-466b-bbf7-5b333a148373 | fl *accept*

 

 

AcceptMessagesOnlyFrom : {}

AcceptMessagesOnlyFromDLMembers : {aTestGroup19, aTestGroup20}

AcceptMessagesOnlyFromSendersOrMembers : {aTestGroup19, aTestGroup20}

 

When a distribution group with these restrictions were migrated, the restrictions were subsequently lost. In previous revisions the DLConversionV2 module would record only restrictions on other groups. If the group being migrated had accept messages from senders or members rights to another distribution group these permissions would be preserved. The recording and reinstating of permissions on other recipients was not performed.

 

The DLConversionV2 module now records restrictions across all recipient classes. The module will now replace the restrictions on both found groups and other recipient objects as part of the migration. Happy migrating!