Exchange owa 2010/owa 2013 coexistence not working

Dear All,

  Im in process of migrating my Exchange 2010 to 2013. I have Installed Exchange 2013 as CAS, MBX, I need first to configure my 2013 to be the CAS so when the user with a mailbox in 2010 server still can login to his mailbox from 2013 OWA. I have done the configuration and pointed the 2010 internalURL to something like legacy.mydomain.com but still a user with mailbox in 2010 cant login . when they login they get an error like something wet wrong, I need to enable my users to still login to their mailbox in 2010 the same url mail.mydomain.com, can someone advise pls
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ITMaster1979Asked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
The internal should have a value, the external should be null. That is why you are having problems, because Exchange 2013 doesn't know what to connect to.

It is up to you whether you want to proxy or redirect.
If you want to proxy then you populate the external URL. If you want to redirect then you populate the external URL and have the Exchange 2010 server exposed to the internet.

Simon.
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Simon Butler (Sembee)ConsultantCommented:
Have you got an external URL configured on the Exchange 2010 server?
Are you trying to do proxy or redirection?

Simon.
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ITMaster1979Author Commented:
Hi Simon
Yes in 2010 internal is null, external is https::/legacy.mydomain,com.
But do i need my San certificate to include
Legacy.mydomain.com? Since its new name
Can you advise with the steps to do proxy or redirection ?
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ITMaster1979Author Commented:
Hi Simon,
  I just need the users to stay working while migrations . The URL in the 2010 server should be what name . Do I need to add https:// or jus normal http://
I have many users with owa . Activesync and pop3 that I need to redirect them to 2013 using the old 2010 name mail.mydomain.com
Pls advise
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
You would usually point the existing host name at the Exchange 2013 server. As this is Exchange 2010 as the previous version it will proxy everything.
The internal URL would still be HTTPS and needs to have an SSL certificate that applies.

it is only OWA that can be redirected - everything else will go through the proxy. However with Exchange 2010/2013 coexist you can proxy everything. However there are occasions when you choose not to.

Simon.
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ITMaster1979Author Commented:
can you provide a guide in how to do proxy and redirect, its not working with me,
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
Redirect is nothing more than two unique IP addresses and host names, with the appropriate URLs configured in Exchange.

Proxy is the same, but with no external URL configured. However the internal URL must be resolvable internally so that Exchange can connect. You will probably need to use a split DNS for that to work if the external domain is being used on the SSL certificate.

Simon.
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