Hello,

We wanted to ask the community if anyone has done the following with success:

We are setting up two new domains. One "account" domain, and ones Exchange Resource Forest domain. We want to migrate mailboxes from the existing domain, to the new resource forest. The documentation I have reviewed on this seems to involve simply two domains, and doesn't involve a resource forest with linked mailboxes.

The source domain is using Exchange 2010 SP3. The new resource forest will be Exchange 2013.

So what we want to know is: what is the best way to move mailboxes from the legacy domain to the new ERF once it has been created?

Dell (formerly Quest) Migration Manager for Exchange might be worth a look. I've used it for a similar(ish) scenario into an ERF target.

It can create the target AD accounts, linked mailboxes, and migrate mailbox data as well as do the coexistence stuff. It's not free though :-(

Hi,

In my opinion, maybe we can try the following steps:

1. Create a Matching Mail-Enabled Account in the Target Exchange Forest (resource forest).

2. Do cross-forest mailbox migration from Old resource forest to the new resource forest.

3. Do GAL synchronization between Old resource forest and account forest.

4. Convert the moved mailbox to linked mailbox with the linked account in account forest.

Please understand that there is no official documents about this. The steps above are just my suggestion and I havent done this migration. Hope there are other people can share the helpful suggestions here.

Regards,