How to migrate Exchange mailboxes when restructuring a forest active directory

Hi everybody, I hope somebody can help me, because I have not seen information about my question, in every forum talks about to migrate Exchange to Cloud but not to migrate Exchange to a new Forest so my question is "How to migrate Exchange mailboxes when restructuring a forest active directory" obviously with impact zero and continuing access from users that have been moved to the new forest to his mailbox in the old forest until all users have been migrated and procedure to migrate mailboxes, I dont know why there are not documentation about this, I suspect that I could use ADFS while I am migration with ADMT V3, but I dont know if the users continue accesing his mailbox, I need some documentation. Thanks in advance.

Regards

August 4th, 2015 4:58am

Take a look at this guide for 2010 that will help you to understand the overall process http://blogs.technet.com/b/meamcs/archive/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i.aspx
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August 4th, 2015 6:51pm

Thank you very much, Ill check it!!

Felxs

August 5th, 2015 4:23am

Hi Felx,

Thank you for your question.

In addition above suggestion, Exchange 2013 mailbox cross forest migration could be referred by the following link:

https://technet.microsoft.com/en-us/library/ee861103(v=exchg.150).aspx

If there are any questions regarding this issue, please be free to let me know.

Best Regard,

Jim

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August 7th, 2015 7:34am

Hello

You already have 2 links from colleagues to know how to do it. I would suggest to go for with Pilot mailbox users and not the live users. Consider the below things on priority.

  1. Address book Sync in both forest
  2. Free/Busy Information.
  3. Access of OWA, Outlook and Active Sync and other web services.
August 7th, 2015 7:45am

Remember about LegacyExchangeDN attribute. Do not forget to copy it as well otherwise you will have a huge headache with Outlook autocompletes.  
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August 11th, 2015 5:09am

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