Merging two Exchange organisations

Hi,

I've been tasked with merging the Exchange infrastructure of two businesses. Company B will be merged in to Company A.

Due to the size of the databases, geographical spread of the Exchange servers in Company B and speed of the links ( slow links to cities in India, Africa, etc ) this will be a staged migration.

My plan so far is this:

- Set up trusts between the forests
- Set up a shared SMTP address space
- Set up a shared GAL and free/busy availability across the businesses using FIM ( following http://www.msexchange.org/articles-tutorials/exchange-server-2010/migration-deployment/deep-dive-into-rich-coexistence-between-exchange-forests-part1.html )

At this point, whilst nothing will be 'merged' as such, we should I believe have full interoperability between the businesses in terms of any user being able to send from any email domain, check free busy of any user, etc.

Next, would be to use the cross-domain mailbox move to move mailboxes over in stages - as we already have interoperability, nothing should change once we move a mailbox over.

Am I missing anything? Does this seem a good plan?

Thanks!
Endian XAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Will SzymkowskiSenior Solution ArchitectCommented:
At a high level based on what you have outlines looks fine. You will have complete inter-operability between the 2 forests and Exchange environment. At that point when you are ready migrate the mailboxes to the deciding forest and you can then collapse the other forest.

I don't see any issues with what you are trying to achieve.

Will.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Endian XAuthor Commented:
Great - always good to have an outside sanity check!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.