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AD and Exchange integration when purchasing a new company

Posted on 2016-09-13
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Last Modified: 2016-09-27
Hi,

We just bought a company of about 100 users. We are 1000 staff large. They have their own Data Center, with their own AD which is part of a larger forest, and they use exchange 365 whereas we have on premise.

I assume the approach would be to create a one-way external trust, Security groups define access to our systems. However, how should I manage exchange 365 if they are on a tenant, eg, fin01.local? Can I simply migrate their accounts into our on premise exchange (is that doable since we are separate companies?) or do they need a local exchange member server and have it important there?
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Question by:Daniel Garcia
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Vasil Michev (MVP) earned 2000 total points
ID: 41797349
You can off-board them on-prem, but you need some prerequisites. Steve has a very detailed guide here: http://www.msexchange.org/articles-tutorials/office-365/exchange-online/migrating-standalone-office-365-tenant-exchange-2010-part1.html
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Author Comment

by:Daniel Garcia
ID: 41805839
Hi Vasil,

Thanks for that but what happens if the tenant and your company domain is different.

For example, they are a different company with different domain we have just purchased. Will we be allowed to migrated mailboxes directly into our exchange or is it a 2 step process of having to setup exchange on their end, migrate to their mail server, then do some sort of migration over our converged network?
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Expert Comment

by:Vasil Michev (MVP)
ID: 41805899
You can migrate them to your on-prem Exchange directly.
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Author Closing Comment

by:Daniel Garcia
ID: 41818874
Thanks for the links. Very helpful.
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