Migration and co-existence Exchange 2007 to 2010

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Migration from Exchange 2007 to Exchange 2013
Asked by: joebilek

Perhaps someone has succeeded in doing this so I thought I would ask:)

We have an exchange 2007 server running on win 2008 R2. Many mailboxes.
The server has all roles, client access role, transport, mailbox.
We want to migrate over to One Exchange 2010 server, mailbox by mailbox if possible during a month or so - means they need to co-exist and work together.

Has anyone done this? any step-by-step lists on the web? the new server should co exist perhaps first as mailbox role - and mailflow goes thru the old or?
Appreciate any help,
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
This is the only way to migrate.
However if you want to have both OWA available then you will need two external IP addresses and external host names.

Microsoft have a tool that will guide you on the migration progress.

Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
We have migrated from Exchange 2003 to 2010.

Are these both Exchange in same forest or New AD\Exchange Forest ?
MX pointing to some Firewall or Exchange itself ?
Number of Mailboxes in Old environment as of date ?

Look you will get number of Articles on the net and we can share but how many can you read ?

- Rancy
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joebilekAuthor Commented:
Hi, I´ve read the first link by Sembee2, it felt as a cutover and not over-time-migration. But good if it is.

We are moving from 2007.

Both servers will be in same AD/forest, Mx points to a firewall so we can direct the mailflow whereever we want to.

Approx 600 mailboxes at the moment.

Yes, my idea was to find info/articles that describe as close as possible our scenario.

Simon Butler (Sembee)ConsultantCommented:
The link that I provided gives you the steps that you need to take. They are no different whether you are doing it quickly or over a period of time.

The key thing is to decide whether you are going to have an extended period of coexistance where OWA access is going to be required. If so then you need to look at the co-existance documentation on Technet.

The process isn't very difficult at all, the places where people get caught up is in the URLs and trying to get Exchange 2007 to proxy to 2010 (which it will not) and other things like that.

joebilekAuthor Commented:
Will need to do a plan and review the links, will be back soon. We are not sure on the connection between co-existing servers. Then theres many steps but I guess they are simple todo and stop if necessary?
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Please do consider changing the routing from Firewall to New server and vice-versa ....

Are you doing a Swing migration ?
Articles arent a issue as you can have tens over internet ... if doubts with some task do let know

- Rancy
joebilekAuthor Commented:
Thank you for the input.

We decided based on the risk of the migration that we will use external consultants when doing this. Thank you for the urls, that helped.
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