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Merge two domains to one Active Directory

    General discussion

  • Hello,

    I consider that our case is particular and this is the reason why I am opening a new discussion. Please consider that I need precise answers on this specific situation so please help me.

    The scenario is one where 2 companies merge. The companies has several offices in separate geographical locations connected through VPN tunnels.

    There are two separate Domains „domain-A” and „Domain-B” each one with a single Active Directory Structure. Each domain is controlled by Domain Controllers in two of the main offices. Domain A has around 100 registered users and Domain B has 600. There are two Exchange servers, one for each domain. The picture is as follows:

    =================================+===========================================

    Domain A – 600 users – location A                    |   Domain B – 100 – users – location B

    =================================+===========================================

    DC1- Windows 2003                                                |   (v)DC1 - Windows 2008

    DC2 - Windows 2003                                               |   (v)DC2 - Windows 2008

    (v)DC3 – Windows 2003                                         |  

    (v)EXCH – Windows 2008 – Exchange 2007    |   (v)EXCCH – Windows 2008 – Exchange 2007

    =================================+===========================================

    (v)= virtualised

    The objective is to upgrade and restructure the domains / merge theese domains into a new domain „Domain-C” without interrupting the activity in any way (we cannot take any risks).

    Domanin C – would have 700 users and would be installed on Windows 2012 platform. The structure image should be:

    =================================+================================================

    Domain C – 700 users – location A                     |   Domain C –  location B

    =================================+================================================

    DC1- Windows 2012                                                |   (v)Read only DC - Windows 2012 –for fast authentication

    DC2 - Windows 2012                                               |  

    (v)DC3 – Windows 2012                                         |  

    (v)EXCH – Windows 2012 – Exchange 2010    |   (v)EXCH – Windows 2008 – Exchange 2010 – 100 mailboxes

    =================================+================================================

    (v)= virtualised

    So I am looking for any suggestions on the best way to handle this.

    Thank you.

    Saturday, September 21, 2013 8:04 PM

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