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Tricky Migration from Exchange 2003 to Exchange 2010: help understanding co-existence mode

    Dotaz

  • Hello Exchange experts,

    The scenario is the following: old server (Exchange 2003) is to be decommissioned. Currently, it is the only mail server and mail.domain.com points to it. Its public IP of 1.1.1.1 is NAT-ed to its internal IP of 192.168.1.1.

    The new server, Exchange 2010, will be across a Metro E network, with a public IP of 2.2.2.2, and a private IP of 10.1.1.1. It will be behind a different gateway.

    I am a little unclear on how the two servers will function in co-existence mode. Before the mailboxes are moved, everyone would still connect to the old server and that server would handle incoming and outgoing mail.  When the mailboxes are moved, can the old server still handle incoming and outgoing mail? That would be ideal because the public MX records will still be pointing to it. What about Outlook clients? They would discover the new server at that point? Any thoughts?

    23. února 2012 14:43

Odpovědi

  • No worries.

    If we are talking about OWA then it works like this:

    1. User browses to https://mail.domain.com/Exchange

    2. This request hits the 2010 CAS which identifies that the user's mailbox is on 2003 - The user will see the 2010 style OWA login page

    3. The CAS sends a redirect to the client and supplies legacy.domain.com as the new URL

    4. The browser automatically redirects to this URL which connects them to the 2003 server which will present the old 2003 OWA interface.

    As long as all your clients can resolve the legacy domain name and connect to port 443 on that IP address then you can just use an external A record.

    23. února 2012 16:08
  • You should really take a look at the following links regarding the upgrade for CAS

    http://technet.microsoft.com/en-us/library/ee332348.aspx

    And one for OWA

    http://blogs.technet.com/b/exchange/archive/2009/12/02/3408921.aspx

    Redirection/Proxying

    http://technet.microsoft.com/en-us/library/bb310763.aspx

    Jonas Andersson | Microsoft Community Contributor Award 2011 | MCITP: EMA 2007/2010 | Blog: http://www.testlabs.se/blog | Follow me on twitter: jonand82

    24. února 2012 9:51

Všechny reakce

  • Hi

    For OWA you will need to change mail.domain.com to point to 2.2.2.2.  The 2010 CAS will provide a redirection URL to users with mailboxes on 2003, something like legacy.domain.com which you will create a DNS A record for pointing to 1.1.1.1.

    You can leave you MX records where they are for the moment and change them to point to 2010 during or after the migration.  MX records don't have any impact on client access and your Outlook client will point to whichever server their mailbox is on.

    Cheers, Steve

    23. února 2012 14:51
  • Steve,

    Thanks a lot for the help! I am just a little unclear on how to get the users redirected.  Are we talking about a public DNS or an internal DNS record that we have to create? The instructions on the MS website were very confusing...

    23. února 2012 15:59
  • No worries.

    If we are talking about OWA then it works like this:

    1. User browses to https://mail.domain.com/Exchange

    2. This request hits the 2010 CAS which identifies that the user's mailbox is on 2003 - The user will see the 2010 style OWA login page

    3. The CAS sends a redirect to the client and supplies legacy.domain.com as the new URL

    4. The browser automatically redirects to this URL which connects them to the 2003 server which will present the old 2003 OWA interface.

    As long as all your clients can resolve the legacy domain name and connect to port 443 on that IP address then you can just use an external A record.

    23. února 2012 16:08
  • You should really take a look at the following links regarding the upgrade for CAS

    http://technet.microsoft.com/en-us/library/ee332348.aspx

    And one for OWA

    http://blogs.technet.com/b/exchange/archive/2009/12/02/3408921.aspx

    Redirection/Proxying

    http://technet.microsoft.com/en-us/library/bb310763.aspx

    Jonas Andersson | Microsoft Community Contributor Award 2011 | MCITP: EMA 2007/2010 | Blog: http://www.testlabs.se/blog | Follow me on twitter: jonand82

    24. února 2012 9:51