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Coexistance 2003/2010 question - can this configuration be done?

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  • Coexistance 2003/2010 question - can this configuration be done?

    I'll try to keep it simple, this would be PERMANENT config, not a temporary. These two environments will have to coexist for some time.

    1 forest/domain, 2 physical buildings on two continents.

    Building 1- I will migrate from two exchange 2003 server to two 2010
    Building 2 - will keep 1 exchange 2003 server (same as now)

    currently:
    - all emails from outside come into Building 1 -> exchange 2010
    - if recipient is in building 2 it will be sent there
    - if recipient is local it ends up in a 2010 database

    when building 2 sends emails out -> I want it to leave their building without having to go to building 1

    when building 1 sends emails out -> it goes out through their internet connection

    I don't see why not, but if anyone can confirm I would really appreciate it. I am preparing everything for my migration, but without a lab (which sadly I just cannot setup due to $$$) I am going to be doing this live and having building 2 drop off the map and not receive any new emails or not be able to send would be a major issue

    one thing I am not sure about is the outlook web app/OWA, since one of the 2003 I will be decomissioning is doing OWA will the 2010 outlook web app be able to access mailboxes in building 2? I hope so, otherwise I will have to setup OWA in building 2 I guess with its own DNS name/public IP , no big deal , just extra work.

  • #2
    Re: Coexistance 2003/2010 question - can this configuration be done?

    yes its possible

    coexist exchange 2003 and 2010 and you find a heap of stuff on it.

    http://technet.microsoft.com/en-us/l.../aa998604.aspx

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    • #3
      Re: Coexistance 2003/2010 question - can this configuration be done?

      Originally posted by ZrOuT View Post
      one thing I am not sure about is the outlook web app/OWA, since one of the 2003 I will be decomissioning is doing OWA will the 2010 outlook web app be able to access mailboxes in building 2? I hope so, otherwise I will have to setup OWA in building 2 I guess with its own DNS name/public IP , no big deal , just extra work.
      I would do it with 2 DNS names. Exchange 2010 can proxy access to legacy OWA sites, but it will be done through your site-to-site connection which will create unneccessary WAN traffic and possibly be slow. For that reason I would maintain seperate DNS names and have all external Exchange traffic going directly to the external IP of the appropriate site.
      BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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      • #4
        Re: Coexistance 2003/2010 question - can this configuration be done?

        Originally posted by cruachan View Post
        I would do it with 2 DNS names. Exchange 2010 can proxy access to legacy OWA sites, but it will be done through your site-to-site connection which will create unneccessary WAN traffic and possibly be slow. For that reason I would maintain seperate DNS names and have all external Exchange traffic going directly to the external IP of the appropriate site.
        Er no.
        Exchange 2010 doesn't proxy OWA, it redirects. If you want to keep both Exchange 2003 and 2010 then you need a "legacy" host name which Exchange 2010 will redirect users to.

        Therefore having the Exchange 2003 server in the second location directly exposed to the internet will be fine, as long as the legacy host name connects.

        Simon.
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        Exchange MVP

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        • #5
          Re: Coexistance 2003/2010 question - can this configuration be done?

          would someone have more info on the legacy namespace? I read about it in exchange migration books, but I can't seem to really get a good idea what to do with it.

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