Hi all,

I am migrating AD users from forest A to forest B but these users have linked AD accounts and mailboxes in the target domain, my query was what is the best method to migrate the users?

Other information:

Forest A (to be decommissioned), running at windows 2003 forest and domain functional level

Forest B, running at windows 2003 forest and domain functional level

I plan on using ADMT 3.2.

Hi

 Also you said ADMT is the best tool for migration.Just you need forest trust between these 2 forest.

Hi Burak,

I am familiar with setting of ADMT, my question was regarding migration users from domain A to domain B were the users already have linked mailboxes. Therefore they already have accounts in the target domain. I need a process to move users from domain A to domain B with SID history and also link them to the existing mailboxes.

Hi,

For converting you may need to disconnect the mailbox and then reconnect it to the new user.

ADMT Migrated Enabled Accounts and Linked Mailboxes

https://social.technet.microsoft.com/Forums/exchange/en-US/9dd41456-a699-41ee-a770-8f6abc8c30aa/admt-migrated-enabled-accounts-and-linked-mailboxes?forum=exchangesvrdeploylegacy

Regards.

Hi,

Any update about the issue?

Regards.

Hi

 ALso you could migrate Exchange mailboxes by cross forest move;Check this for detailed information about,

http://technet.microsoft.com/en-us/library/ee633491(v=exchg.150).aspx