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EXCHANGE 2007 / 2010 COEXISTENCE OWA RRS feed

  • Question

  • I have an existing Exchange 2007 install.  One server has three roles, CAS / HUB / and Mailbox.  We are transitioning to Exchange 2010.  I have installed the 2010 CAS / HUB roles on one server and the mailbox role on another. I have not moved any mailboxes as of yet.  Everything still resides on the 2007 server.

    Internally, OWA works fine.  If I go to https://internalmail/owa, I am prompted with the yellow 2010 OWA login screen (yellow screen = 2010, blue screen = 2007).  I can login just fine and my mailbox appears with no issues.

    Externally, if I go to https://externalmail/owa, I am prompted with a new ssl certificate prompt and if I acceept, I get the yellow 2010 OWA login screen. So far so good.

    However, when I login to OWA, I get a page cannot be loaded error and the error mentions that the host is responding in a way that will never get resolved.

    I did change the address translations in the firewall. So, before the switch to 2010, the externalmail ip address 1.2.3.4 was pointing to 10.1.1.45, which was the 2007 all in one server.  After installing 2010, I pointed the externalmail ip address 1.2.3.4 to 10.1.1.46, which is the new 2010 CAS / HUB server.  Essentially, the external ip address on the public side did not change and still has the same dns name, externalmail.  Only the internal ip address changed.  So to end users, they still type in the same address that they have always used.

    Final note is that if I use a new external ip address for externalmail, for example 1.2.3.5 and map it to the new CAS / HUB ip of 10.1.1.46, OWA works externally just fine.

    What steps have I missed that allows the existing externalmail ip address of 1.2.3.4 for OWA to work externally?  I can't seem to find the solution and I have searched extensively for the answer.

    Thank you in advance.

    Sunday, November 14, 2010 11:58 PM

Answers

  • You have made a common mistake and presumed that Exchange 2010 works in the same way as previous versions - that you can have users on both servers access OWA through the same server. Even I made that error when I first setup Exchange 2010.

    Unfortunately that is not the case. Exchange 2010 will not proxy the older versions of OWA. You need to have both Exchange 2010 and Exchange 2007 exposed to the Internet, with unique URLs and appropriate SSL certificates. Users on the old server will be redirected to the old server if that is where their mailbox is held. You will need to ensure the external URL is configured correctly on the Exchange 2007 server etc.

    Therefore to have a co-existence period you will need to have two external IP addresses and relevant host names, and the name of both external facing host addresses in the SSL certificate (allowing you to have one SSL certificate shared between both servers).

    Simon.


    Simon Butler, Exchange MVP
    Blog | Exchange Resources
    • Marked as answer by Gavin-Zhang Thursday, November 18, 2010 7:32 AM
    Monday, November 15, 2010 11:06 AM
  • Hi,

    You will have to confiure legacy name for the Exchange 2007 Internal url and you will have to disable External Url on Exchange 2007.

    Please refer to the below article's for more inforamtion on the upgradge path from Exchange 2007 to Exchange 2010.

    http://technet.microsoft.com/en-us/library/dd351133.aspx 

    http://technet.microsoft.com/en-us/library/bb124350.aspx

    Thanks.


    Nagaraj N
    • Proposed as answer by Gavin-Zhang Thursday, November 18, 2010 7:31 AM
    • Marked as answer by Gavin-Zhang Thursday, November 18, 2010 7:32 AM
    Monday, November 15, 2010 1:08 PM

All replies

  • You have made a common mistake and presumed that Exchange 2010 works in the same way as previous versions - that you can have users on both servers access OWA through the same server. Even I made that error when I first setup Exchange 2010.

    Unfortunately that is not the case. Exchange 2010 will not proxy the older versions of OWA. You need to have both Exchange 2010 and Exchange 2007 exposed to the Internet, with unique URLs and appropriate SSL certificates. Users on the old server will be redirected to the old server if that is where their mailbox is held. You will need to ensure the external URL is configured correctly on the Exchange 2007 server etc.

    Therefore to have a co-existence period you will need to have two external IP addresses and relevant host names, and the name of both external facing host addresses in the SSL certificate (allowing you to have one SSL certificate shared between both servers).

    Simon.


    Simon Butler, Exchange MVP
    Blog | Exchange Resources
    • Marked as answer by Gavin-Zhang Thursday, November 18, 2010 7:32 AM
    Monday, November 15, 2010 11:06 AM
  • Hi,

    You will have to confiure legacy name for the Exchange 2007 Internal url and you will have to disable External Url on Exchange 2007.

    Please refer to the below article's for more inforamtion on the upgradge path from Exchange 2007 to Exchange 2010.

    http://technet.microsoft.com/en-us/library/dd351133.aspx 

    http://technet.microsoft.com/en-us/library/bb124350.aspx

    Thanks.


    Nagaraj N
    • Proposed as answer by Gavin-Zhang Thursday, November 18, 2010 7:31 AM
    • Marked as answer by Gavin-Zhang Thursday, November 18, 2010 7:32 AM
    Monday, November 15, 2010 1:08 PM
  • Thanks.  I was able to get it going by setting up the legacy.comapny.com dns entries, both internal and external.
    Wednesday, December 1, 2010 10:25 PM
  • Thank you kindly for the detailed information.

    I found this article: http://blogs.technet.com/b/sjimmie/archive/2010/07/09/owa-coexistence-with-legacy-versions.aspx which explains how to configure the "Proxy" portion of the coexistence.  Do you perhaps know if such configurations will work and is supported?  If this solves the proxies for OWA, will this also work for Outlook Anywhere & other Remote Sync services such Blackberry Internet Services?

    Thanks in advance.

    Friday, February 24, 2012 10:00 AM
  • Hello Simon,

    I am setting up pilot phase of exchange 2010 migration from exchange 2007.

    FIRSTLY, I want to clarify our existing setup.

    i have three sites running in exch 2007 with one url called webmail.domain.com for OWA/OA/EAS every sites having one CAS server.

    I want to setup exchange 2010 with separate url called owa.domain.com. so that the exch 2010 users will connect using their oa.domain.com url and exchange 2007 users will connect through webmail.domain.com.

    i need your guys help to configure the 2010 CAS role and generate certificate so that the existing user will not impact.

    You can add me on my Gtalk: sanjuroy12@gmail.com

    Regards

    Sanjay

     

     

     

    Sunday, December 9, 2012 12:29 PM