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Exchange 2010 CAS coexistance with Exchange 2007 mailbox RRS feed

  • Question

  • We have Exchange Server 2007 SP2 infrastructure with 2 Mailbox CCR, 2 HUB/CAS NLB & a Edge Server with ForeFront TMG providing reverse proxy. I wanted to know whether we can have Exchange 2010 HUB/CAS NLB in place Exchange 2007 with remaining Exchange 2007 Server in place. I wanted to have Exchange 2010 OWA and other features offered by it.

    Your feedback would be appreciated.

    Wednesday, May 26, 2010 6:39 AM

Answers

  • No you can not replace the Exchange 2007 CAS server with Exchange 2010 CAS. Exchange 2010 CAS does not support rendering mailboxes from legacy versions of Exchange.

    For OWA:

    • When the Exchange 2007 mailbox is in the same AD Site as Exchange 2010 CAS, Exchange 2010 CAS will silently redirect the session to the Exchange 2007 CAS.
    • When the Exchange 2007 mailbox is in another Internet facing AD Site, Exchange 2010 CAS will manually redirect the user to the Exchange 2007 CAS.
    • When the Exchange 2007 mailbox is in a non-Internet facing AD site, Exchange 2010 CAS will proxy the connection to the Exchange 2007 CAS.

    For ActiveSync:

    • When the Exchange 2007 mailbox is in the same AD Site as Exchange 2010 CAS and the device supports Autodiscover, Exchange 2010 CAS will notify the device to synchronize with Exchange 2007 CAS.
    • When the Exchange 2007 mailbox is in the same AD Site as Exchange 2010 CAS and the device does not support Autodiscover, Exchange 2010 CAS will proxy the connection to Exchange 2007 CAS.
    • When the Exchange 2007 mailbox is in a non-Internet facing AD site, Exchange 2010 CAS will proxy the connection to the Exchange 2007 CAS.

    For Outlook Anywhere:

    When migrating Outlook Anywhere you move the Outlook Anywhere endpoint from the Exchange Exchange 2007 CAS to the Exchange 2010 CAS. Exchange 2010 CAS will then proxy the Outlook MAPI RPC to either the Exchange 2007 Mailbox server or the Exchange 2010 Mailbox server depending on the mailbox home server.

    So in all scenarios for OWA and Activesync you would still need the Exchange 2007 CAS to handle requests for Exchange 2007 mailboxes.


    Martin Sundström | Microsoft Certified Trainer | MCITP: Enterprise Messaging Administrator | http://msundis.wordpress.com
    Wednesday, May 26, 2010 6:58 AM

All replies

  • No you can not replace the Exchange 2007 CAS server with Exchange 2010 CAS. Exchange 2010 CAS does not support rendering mailboxes from legacy versions of Exchange.

    For OWA:

    • When the Exchange 2007 mailbox is in the same AD Site as Exchange 2010 CAS, Exchange 2010 CAS will silently redirect the session to the Exchange 2007 CAS.
    • When the Exchange 2007 mailbox is in another Internet facing AD Site, Exchange 2010 CAS will manually redirect the user to the Exchange 2007 CAS.
    • When the Exchange 2007 mailbox is in a non-Internet facing AD site, Exchange 2010 CAS will proxy the connection to the Exchange 2007 CAS.

    For ActiveSync:

    • When the Exchange 2007 mailbox is in the same AD Site as Exchange 2010 CAS and the device supports Autodiscover, Exchange 2010 CAS will notify the device to synchronize with Exchange 2007 CAS.
    • When the Exchange 2007 mailbox is in the same AD Site as Exchange 2010 CAS and the device does not support Autodiscover, Exchange 2010 CAS will proxy the connection to Exchange 2007 CAS.
    • When the Exchange 2007 mailbox is in a non-Internet facing AD site, Exchange 2010 CAS will proxy the connection to the Exchange 2007 CAS.

    For Outlook Anywhere:

    When migrating Outlook Anywhere you move the Outlook Anywhere endpoint from the Exchange Exchange 2007 CAS to the Exchange 2010 CAS. Exchange 2010 CAS will then proxy the Outlook MAPI RPC to either the Exchange 2007 Mailbox server or the Exchange 2010 Mailbox server depending on the mailbox home server.

    So in all scenarios for OWA and Activesync you would still need the Exchange 2007 CAS to handle requests for Exchange 2007 mailboxes.


    Martin Sundström | Microsoft Certified Trainer | MCITP: Enterprise Messaging Administrator | http://msundis.wordpress.com
    Wednesday, May 26, 2010 6:58 AM
  • What if we have Exchange 2007 Mailbox & Edge & Exchange 2010 Hub/CAS, would user be able to get Exchange 2010 OWA.
    Fazal Ur Rehman Shah | Senior Consultant
    Wednesday, May 26, 2010 11:06 AM
  • No As long as you have the Exchange 2007 Mailbox server you need a Exchange 2007 CAS. All users still residing on the Exchange 2007 Mailbox server would use the Exchange 2007 CAS and therefore get the OWA for Exchange 2007.

    For the users to be able to use the Exchange 2010 features you need to implement Exchange 2010 CAS, HUB and Mailbox server and then move the users to the Exchange 2010 Mailbox server.


    Martin Sundström | Microsoft Certified Trainer | MCITP: Enterprise Messaging Administrator | http://msundis.wordpress.com
    Wednesday, May 26, 2010 11:15 AM
  • So, no go with using 2007CAS and a 2010 server with only the mailbox roles?  I thought in earlier versions of Exhange the OWA proxied to the mailbox back end servers?

    Monday, July 16, 2012 7:25 PM