Hi there. I know this is an old topic, but I would greatly appreciated if anyone can give me some inputs on this. This is what I need to achieve:
1. Currently having 1 AD Domain (Windows 2008 R2) - Need to setup a new Domain (Windows 2012 R2) in a new forest and migrate all the AD users to the new AD environment
2. Currently having Exchange 2013 in old forest - Need to setup Exchange 2013 in new forest and migrate all the mailbox(s) to the new Exchange 2013 forest. The new Exchange 2013 forest would need to use (share) the same SMTP Name Space as the current (old) Exchange 2013. Co-existence is required while the migration work is in progress. Once all data from old AD and Exchange migrated to the new AD and Exchange forest, we will decommission the old AD and Exchange servers.
From this URL below, this is the similar steps I assume would meet my goal.
https://social.technet.microsoft.com/Forums/office/en-US/6159a52c-d154-461c-b7ab-c84592e60f32/exchange-and-ad-migration-to-new-forest?forum=exchangesvrdeploy
- Install Exchange 2013 in the target forest
- Configure DNS for a forest trust
- Set up a forest trust
- Set up GAL sync which you will need to use to sync the GALs between the forests: https://technet.microsoft.com/en-us/library/bb124734(v=exchg.150).aspx
- Configure cross site availability service for free/busy information transfer between forests: https://technet.microsoft.com/en-us/library/bb125182(v=exchg.150).aspx
- Configure cross forest mail flow using internal relay accepted domains for the source forest domains on the target forest: http://markgossa.blogspot.co.uk/2015/09/exchange-2013-cross-forest-mail-flow.html
- Migrate AD groups using ADMT
- Stage AD users using ADMT
- Migrate AD users using ADMT, prepare for a cross forest move request (Prepare-MoveRequest.ps1) and move the mailboxes: https://technet.microsoft.com/en-us/library/ee633491(v=exchg.150).aspx, http://blogs.technet.com/b/meamcs/archive/2011/10/25/exchange-2010-cross-forest-migration-step-by-step-guide-part-i.aspx
- Prepare for decommissioning the servers in the source forest
- Decommission servers in the source forest
This looks pretty straight forward. My question were as the following:
a) How should I configure Autodiscover for external clients? My understanding is Autodiscover only works on 1 forest, which means on the new AD forest, there would be no Autodiscover service for external clients.
b) To share Free / Busy info between the two Exchange forest, I can utilize the "Add-AvailabilityAddressSpace" Exchange Powershell command?
c) To share Global Address List (GALSync) between the two Exchange 2013 forest, do I must use either FIM or ILM? Is there are any built-in tools that can achieve the same result?
d) How do I migrate Exchange resource mailbox (eg: room) to the new Exchange forest? Is that the same process as the user mailbox migration?
Thank you.