Hello,
We are looking to achieve 2 migration tasks: one is to upgrade one Exchange organisation from 2010 to 2013 and the second is to migrate mailboxes from the second organisation to the new 2013 server.
To explain the scenario in a bit more detail:
Forest A – 1 AD domain with a single Exchange 2010 server
Forest B – 1 AD domain with a single Exchange 2010 sever
Stage 1 – Migrate Forest A to Exchange 2013
Stage 2 – Migrate mailboxes from forest B to forest A but still keep forest B as its own AD domain. Or to put it another way; we want the users in forest B to have their mailboxes migrated to forest A (linked mailboxes?) but still keep use forest B to login etc, essentially making forest A a resource forest for users in forest B
I hope that makes sense! One of my main concerns is I am assuming it is possible to perform a cross forest migration from forest B which will be at 2010 to forest A which will be 2013. Would it be better to perform the cross forest migrations before hand?
If someone is able to let me know if what I am proposing is possible I would be extremely grateful.