Currently I have MIM sync implemented with GALSYNC to create and manage cross forest contacts. Now I want to expand on this. We are currently doing a cross forest move of users with ADMT, Prepare-mailboxmove.ps1. This process works fine, a user in A is move to B and through SID history they also keep their group memberships. What I want to do is populate the corresponding Mail Enabled distribution groups with the users contact in Domain B, when the user is migrated to domain B the contact is created in A (Currently working) and the contact is also added to the correct Distribution Group. Is this even possible?
| Domain A | Domain B |
| USER.A1 | USER.B1 |
| Contact.B1 | Contact.A1 |
| Before Migration | |
| DL | DL |
| Contact.B1 | User.B1 |
| After migration | |
| DL | |
| User.B1 | Contact.B1 |