1. I have to perform cross forest migration between exchange 2007 to exchange 2010. Please let me know step by step procedure of migration.
2. ABC.com primary site and XYZ.com Site A are in same location or same datacenter.

As of now we are restoring emails from source one and then exporting user emails into pst and then uploading in new domain.

Users are migrating from ADMT tool and we are using DirSync for synronisation.


Following is organisation details:

Forest ABC & Forest XYZ

In Forest ABC

Parent Forest name is ABC.com and having 2 child domain (bah.abc.com & lob.abc.com)

Two way Domain truth has been configure between both forest (ABC.com & CYZ.com)

Here Exchange is 2007 in SCR mode in primary site and also single exchange server configure in DR.
Also in ABBC.com we have email archieving solution emc source one.

In Forest XYZ Current setup is as mention below;

Exchange 2010 (both ent+std) installed on 5 different location and in active directory we have 3 sites A, B, C ( remaining 2 sites pending)

Site A is HO office and Site B will be DR of it and having separate DAG A (3 Mbx srv - 2 Mbx are in Site A and 1 Mbx in Site B but not installed pending)

Site B is DR site for all sites but as of now all 30 databases are active from it.

Site C is Prd site but as of now its passive node and site A and B are part of same DAG B (4 MBX srv - 2 mbx in site B and 2 mbx in site C).

Currently All DNS record are pointing to Site B in DNS like OWA etc.

CAS Array details of 3 sites:
Site A = sitea.xyz.com ( In site A windows NLB is used)
Site B = siteb.xyz.com ( In site A hardware load balancer is used)
Site C = sitec.xyz.com ( In site A hardware load balance

This forum is for Exchange development questions. Your question is better suited for the Exchange migration forum on TechNet. I'll move this post for you. Please keep future posts on topic.

Thanks.

I am only getting exchange 2013 options while creating question.

Hi,

I suggest you can refer to the following article to complete the migration:

http://blogs.technet.com/b/meamcs/archive/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i.aspx

I have found a similar thread for your reference :

https://social.technet.microsoft.com/Forums/exchange/en-US/35828bef-3eaa-4540-b2ef-0dc1da0d77ca/cross-forest-migration-from-exchange-2007-to-exchange-2013?forum=exchangesvrgeneral

Regards,

David 

You can move the mailboxes from the 2007 environment to the 2010 environment using Powershell in 2010: http://blogs.technet.com/b/exchange/archive/2010/08/10/3410619.aspx

You can use New-MoveRequest command to perform a cross-forest move. Here is a well post and step-wise explanation you can check it from here

Prepare Mailboxes for Cross-Forest Move Requests

You may also take help from below given earlier discussed threads having suggested solutions to get this job done.
Details steps for exchange 2007 to exchange 2010 cross forest migration

Exchange 2007 SP2 to Exchange 2010 Cross Forest Migration

Moreover, If you wish you may also try this exchange cross forest migration solution to accomplish this task.

Hope it helps you!