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Upgrade to Exchange 2010 OWA from mixed 2007 and 2003 environment

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  • Upgrade to Exchange 2010 OWA from mixed 2007 and 2003 environment

    Hi,

    I am upgrading a mixed Exchange environment, 2007 and 2003, to Exchange 2010.

    My query relates to upgrading OWA. Currently the setup is that there are no FrontEnd 2003 servers but 2007 CAS processes all requests, through ISA. I will be removing the Exchange 2007 mailboxes and hardware but I will need to have the 2003 mailboxes operational over a period of time so will need to allow them have OWA access.

    What is the best way to provide this access. Should I be able to process OWA traffic through the Exchange 2010 CAS using legacy.domain.com even though there are no Exchange 2003 FE or do I need to keep the 2007 CAS operational till all 2003 mailboxes have been moved to 2010?

    Regards,

    Barbara

  • #2
    Re: Upgrade to Exchange 2010 OWA from mixed 2007 and 2003 environment

    Hi,

    Think this is the way I have to do it

    In exchange 2003 we deploy front end servers to achieve contiguous namespace. It is just a proxy server. The process will remain same irrespective of the fact that front end severs are deployed or not.
    If you do not have front end servers. Backend servers provides OWA functionality.
    Users whose mailboxes are on exchange 2003, will connect to exchange 2010 CAS URL “ mail.contoso.com” and will be redirected to exchange 2003 backend server.

    Only question now is how to change the url on the backend servers to accept the legacy.contoso.com address that 2003 users are directed to when logging on to mail.contoso.com

    Comment


    • #3
      Re: Upgrade to Exchange 2010 OWA from mixed 2007 and 2003 environment

      Exchange 2010 can only serve directly the Exchange 2010 mailboxes.
      Older versions need to be managed by Exchange 2007 CAS or Exchange 2003 frontend servers with a unique separate URL.

      If you have Exchange 2007 CAS servers then leave those in place. You do not configure a URL for the Exchange 2003 directories, because Exchange 2003 simply doesn't care.

      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


      • #4
        Re: Upgrade to Exchange 2010 OWA from mixed 2007 and 2003 environment

        Thanks for response.

        Issue is I have to remove the 2007 servers as they are hosted by an external company but the 2003 mailboxes will only be moved in sections so need to put an Exchange 2003 FE server in place. Only issue is trying to get the following working for the Exchange 2003 mailboxes

        External OWA https://mail.contsoso.com/owa > CAS 2010 > Exchange 2003 FE > Exchange 2003 mailbox.

        The external OWA is working for the 2010 clients but I cannot get the CAS to redirect to legacy.contoso.com

        Comment


        • #5
          Re: Upgrade to Exchange 2010 OWA from mixed 2007 and 2003 environment

          Are the Exchange 2007 servers in your forest?
          If not, then no redirection is going to take place.
          If they are, then build them inhouse. That is going to give you the best experience, rather than trying to build Exchange 2003 frontend servers.

          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


          • #6
            Re: Upgrade to Exchange 2010 OWA from mixed 2007 and 2003 environment

            Thanks Simon, was able to agree with the customer to leave the Exchange 2007 hardware in place till all the 2003 maiboxes were migrated. Much easier!

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