Autodiscover after deploying Exchange 2013 CAS in a Exchange 2007 organization

I am deploying Exchange 2013 CAS in a Exchange 2007 organization. Will all the clients be directed to the Exchange 2013 CAS servers for autodiscover. Will there be any issue with outlook clients connecting to their mailbox servers in Exchange 2007

All clients should be pointed to the Exchange 2013 CAS for the autodiscover service. This means:
A. For local clients
You need to modify the autodiscover Internal URI on the Exchange 2007 server and point it to Exchange 2013. For example, if you are using split-brain DNS on the Local Network and mail.yourdomain.com is resolved to Exchange 2013 local IP, the Exchange 2007
Autodiscover Internal URI should be "https://mail.yourdomain.com/Autodiscover/Autodiscover.xml" 
Exactly the same way, you should modify the Exchange 2013 Autodiscover Internal URI and use the same address "https://mail.yourdomain.com/Autodiscover/Autodiscover.xml"
B. For remote clients - all clients will hit the Exchange 2013 CAS first (ex. mail.yourdomain.com)
If the user's mailbox is on Exchange 2007 server, the correct XML will be generated and provided, and the user will be proxied for Outlook Anywhere/ActiveSync and redirected for OWA/WebServices
If the user's mailbox is on Exchange 2013 server, the correct XML will be generated and provided
Bottom line - based on the location of the user's mailbox, Exchange 2013 will generate and provide the correct XML file (there is not proxying involved in providing the Autodiscover info).

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    Add the following:
    127.0.0.1 crl.microsoft.com – here are the instructions:
    a. Go Start – Programs and choose Command Prompt and choose Run as Administrator.
    b. Within the Command Prompt, change to this directory (the drive will be the one where you installed the OS):
    C:\Windows\System32\drivers\etc\hosts
    c. Add the following entry to the HOSTS file:
    127.0.0.1 crl.microsoft.com
    d. Save the HOSTS file.
    13.
    Rebuild Indexes
    using ResetSearchIndexes.ps1
    How to Rebuild the Full-Text Index Catalog
    http://technet.microsoft.com/en-us/library/aa995966(EXCHG.80).aspx
    a. Go Start – Programs and choose Exchange Management Shell and choose Run as Administrator.
    b. Change to this directory (the drive will be the one where you installed Exchange 2007):
    C:\Program Files\Microsoft\Exchange Server\Scripts
    c. It is suggested that you rebuild indexes for one or a few databases at a time – use the following command to rebuild the indexes for 1
    databases called dbname1 and dbname2:
    .\ResetSearchIndex.ps1 –force dbname1 dbname2
    d. It is suggested not to run the following command unless you have 1 Exchange 2007 server only in your environment because it will cause
    all databases on all Exchange 2007 (and all Exchange 2010 servers, if there are any) to be reindexed at that same time:
    .\ResetSearchIndex.ps1 –force all
    14.
    Monitor the Application Event Log for Event ID 110 for a particular database.
    This will indicate the new index is complete for that database.
    15. After receiving Event ID 110 for a database, check to see if the size of the CatalogData folder for that database is the expected
    5% to 10% of the database size. If the size of the CatalogData folder is significantly smaller than that or if the size is a few kb or a few mb, go
    to Step 17.
    16. After you have received Event ID 110 and the size of the CatalogData folder is normal, test searching in Outlook online mode
    and OWA to make sure search is working. 
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    </strike>
    Ian

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