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Child domains, O365 & Trusts

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  • Child domains, O365 & Trusts

    Hi all,
    Hope everyone has had a good new years?

    I've been tasked with looking into ways to smooth a migration to Office 365 for users, and have had some ideas, but need some 'thoughts' from some of you reprobates!

    Basically, from what i understand of Office 365, to do SSO and reduce downtime, an AD Federated Sync program + Exch2010 Hybrid install is needed.
    For our primary site, that's fine, as we're running Exch2010 anyway.
    Our secondary sites are an issue however, different domains, one of which, has its own Exch2003 install.

    Here lies the question:
    My idea, is to setup site-to-site links using our firewall (ISA) to the other sites (appliances) and then add their domains as child domains of ours then setup 2 way trusts.
    Im hoping that this would have the net effect of allowing all users in all 3 domains SSO ability via the top level domain.
    From what the Office365 'support' doc's say, this should be possible.

    The issue arrives from one of the secondary sites having its own Exch installation, 2003.
    Would this be able to co-exist for a period, without issue or reconfiguration, after its domain has been made a child of another's?
    Ideally, we would 'transfer' the mailboxes from it to our Exch2010 install and then use that to migrate to Office365, but im completely unsure as to how/if that would work with child domains.

    To further complicate things, All 3 sites have their own email domains that are different to their internal domain names.
    All the sites bar the primary will be migrated to a new email domain that will be at Office365, with the primary, still needing to keep its email domain functional in addition to the Office365 one...move secondary's upto 365 and have a custom address policy for main site users needing the old addresses perhaps?

    Any thoughts and advice would be greatly appreciated.

    Thanks in advance all!

  • #2
    Re: Child domains, O365 & Trusts

    You cannot add existing domains as child domains.
    Therefore you are faced with doing a PST migration in to either your Exchange 2010 server or in to Office365 directly.

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
    More Exchange Content: http://exchange.sembee.info/
    Exchange Resources List: http://exbpa.com/
    In the UK? Hire me: http://www.sembee.co.uk/

    Sembee is a registered trademark, used here with permission.

    Comment


    • #3
      Re: Child domains, O365 & Trusts

      Originally posted by Sembee View Post
      You cannot add existing domains as child domains.
      Therefore you are faced with doing a PST migration in to either your Exchange 2010 server or in to Office365 directly.

      Simon.
      Odd. Could have sword that its possible to do...will google about.

      Ok, so working from that premise, what would be the best way of going about the migration to Office365 from the point of view of the other domains?

      Or is it simply a case of the primary domain as its got Exch2010 should be simple, the other two will require PST migrations?

      Comment


      • #4
        Re: Child domains, O365 & Trusts

        Spend as much time on Google as you like, you will not get a different answer. Domains are only created by DCPROMO, and it is during that process that you choose to join another forest or create a new one.

        I can't answer any other questions about Office 365 migrations - not something I get involved with. I want to deploy Exchange servers, not migrate people off them.

        Simon.
        --
        Simon Butler
        Exchange MVP

        Blog: http://blog.sembee.co.uk/
        More Exchange Content: http://exchange.sembee.info/
        Exchange Resources List: http://exbpa.com/
        In the UK? Hire me: http://www.sembee.co.uk/

        Sembee is a registered trademark, used here with permission.

        Comment


        • #5
          Re: Child domains, O365 & Trusts

          Originally posted by Sembee View Post
          I can't answer any other questions about Office 365 migrations - not something I get involved with. I want to deploy Exchange servers, not migrate people off them.

          Simon.
          Do you know of any good O365 resources by any chance?

          Comment


          • #6
            Re: Child domains, O365 & Trusts

            Not really. It is not something I have looked at and discourage clients from doing so, because it is bad for my business. I do know that Microsoft have just awarded their first MVP in Office 365. Don't Microsoft have a support plan for Office365?

            Personally if the investment has been made in Exchange 2010 I don't see why that should be thrown away to move to office365 - the cloud isn't everything. If there are support issues then outsource the Exchange server support, rather than the entire service.

            Simon.
            --
            Simon Butler
            Exchange MVP

            Blog: http://blog.sembee.co.uk/
            More Exchange Content: http://exchange.sembee.info/
            Exchange Resources List: http://exbpa.com/
            In the UK? Hire me: http://www.sembee.co.uk/

            Sembee is a registered trademark, used here with permission.

            Comment


            • #7
              Re: Child domains, O365 & Trusts

              Originally posted by Sembee View Post
              Personally if the investment has been made in Exchange 2010 I don't see why that should be thrown away to move to office365 - the cloud isn't everything. If there are support issues then outsource the Exchange server support, rather than the entire service.

              Simon.
              I agree, but the decision to drop our Exch2010 setup isnt up to me.

              Comment

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