Exchange Transition "2007 SP2 to 2010 SP1"

Scope of work: Transitioning a client from an Exchange 2007 to Exchange 2010. The Exchange environment consist of 2 Exchange 2007 SP2 servers as stated below and will be in a coexistence period. The Exchange servers will all reside in the same AD Site.

Server1:
CAS and HUB TRANSPORT
OWA: mail.clientdomain.com

Server2:
MAILBOX ROLE ONLY

I have spent several hours reading through all known MS KB articles and forums explaining how to place 2 2010 servers into coexistence, order the roles must be installed, legacy URL, etc The specific task I am most concerned with in the installation of the 2010 CAS and Hub Transport roles. From what i am reading most phones are not capable of CAS redirection and this client has over 130 EAS devices. So this has lead me to want to install the new 2010 CAS/HT using another External URL such as webmail.clientdomain.com instead of their existing mail.clientdomain.com.

What are everyone's thoughts about taking this route? How will autodiscover work internally and externally since i can only point the DNS records to 1 CAS server? What about all the Service Connection Point URLs, i assume each of them will point to their respective server. Does anyone have any real world experience with this that can point me in the right direction. All help is greatly appreciated.
bushido2006Asked:
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AkhaterConnect With a Mentor Commented:
You point the current external activesync url to 2010, you configure 2010 external url with the correct url, you remove the external url from your 2007 cas and 2010 cas will take care of the rest.

Once the 2010 is in place and configured autodiscover shoild point to 2010 cas not to 2007
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AkhaterCommented:
You don't need the device to know CAS redirection, all you need to do is install you 2010 cas point the URL to it and remove the external URL form the 2007 cas, the 2010 cas will then proxy the request and not redirect it
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bushido2006Author Commented:
Does this mean that all phones will contnue to work with the existing 2007 CAS/HT server without any intervention? How will the 2010 CAS/HT server proxy the request? I was not planning on changing any routing initially.

As far as autodiscover service, I assume this goes unmodified and contnues to point to the 2007 CAS/HT both internally and externally?

Sounds like i may need to read up more in regards to CAS Proxy as i still dont understand how they will coexist with 2 seperate external URL's
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bushido2006Author Commented:
Thanks fr the info, my concern is that all MS articles i can find don't refer to your method as an approach to transistiong from a CAS 2007 Server. It appears that i must configure the 2007 CAS with the legacy host name.

http://blogs.technet.com/b/exchange/archive/2009/11/20/3408856.aspx
http://technet.microsoft.com/en-us/library/dd351133.aspx

I am in the process of building a 2007 Exchange Server and will perform a test pilot migration to ensure that i have the correct steps down....guess i should have invested time to pilot this transition first before trying to do it in a live enviroment =). As soon as i have tested the transition i will report back how it went......
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AkhaterCommented:
legacy hostname you talk about is valid only for owa not for activesync
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bushido2006Author Commented:
okay just to confirm
install 2010 CAS and point the existing external URL to the 2010
remove the external URL from the 2007 cas
Disable Outlook Anywhere from 2007 CAS
Autodiscover and Mail.clientdomain.com point to 2010 CAS
2010 CAS will then proxy the request for all Active Sync connections
the legacy URL can be configured but only is used for OWA
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AkhaterCommented:
install 2010 CAS and point the existing external URL to the 2010
  Yes
remove the external URL from the 2007 cas
  Yes on activesync that is
Disable Outlook Anywhere from 2007 CAS
   No why ?
Autodiscover and Mail.clientdomain.com point to 2010 CAS
   Yes
2010 CAS will then proxy the request for all Active Sync connections
   Yes
the legacy URL can be configured but only is used for OWA
  Yes and owa 2003 not 2007
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bushido2006Author Commented:
Disable OutLook Anywhere on 2007 CAS??
Truthfully i dont have a good answer for this step, as I read through a co-existance guide and this was a step that was called for.

the legacy URL can be configured but only is used for OWA
So you are saying that if i dont have exchange 2003 mailboxes the legacy URL is not even required.  
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AkhaterCommented:
Yes no needfir kegacy url if you dont have 2003
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bushido2006Connect With a Mentor Author Commented:
http://technet.microsoft.com/en-us/library/dd638158.aspx

AKhater i wanted to than you for responding to all my questions, but it does appear that you need the Legacy URL. I was able to complete a successful coexistance setup using the above URL from Technet and some other purchased deployment guides from the web. if you would like to see all the steps that i used i would be more than hapy to share just send me an email address.

I am still not sure why steps call for diabling CAS 2007 Outlook Anywhere. Everything worked EAS, OA, OWA...etc.
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bushido2006Author Commented:
http://technet.microsoft.com/en-us/library/dd638158.aspx

the above url in my opinion is lacking details but for the most part it has all the steps required to coexist the 2 environments
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bushido2006Author Commented:
just trying to close out the ticket
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