Exchange 2010\2013 co-existence CAS Array members

Hi All,

i have a client that is having some really odd Outlook behavior.

Could somebody with a 2010\2013 co-existence sanity check something for me (google trawling has not helped)

Do Exchange 2013 CAS servers add themselves to the 2010 CAS Array for a site?

Get-ClientAccessArray | Select -expandproperty Members

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contains 2013 servers...

I've done a few migrations, but have never noted this.... the customer is stuck in co-existence due to an old blackberry deployment.

Any help would be appreciated!!

LVL 13
Guy LidbetterAsked:
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MASEE Solution Guide - Technical Dept HeadCommented:
When you install an Exchange2013 to an existing 2010 organization Exchnage2013 CAS servers will be added as a member of CAS Array automatically.

Then your interface will be Ex2013 CAS servers. or Load balancer VIP if you have a load balancer.
i.e. you should point and to Exchange2013 CAS server

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Guy LidbetterAuthor Commented:
Hi Mas

Thanks for this, i am very familiar with it all, I had just not ever taken note that the 2013 CAS populated itself into the 2010 CAS Array. Struggling to find any mention of it in documentation.

Turns out the issue was a hosts file entry on the terminal server pointing the autodiscover namespace to a 2010 CAS box that was removed. Why it was even there befuddles me...

Thanks for confirming this for me...

MASEE Solution Guide - Technical Dept HeadCommented:
Ensure Outlook anywhere is enabled on all clients/PCs as Exchange2013 works only on RPC/HTTP (Outlook Anywhere)
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Guy LidbetterAuthor Commented:
Thanks MAS.
Jon DoeCommented:
You do not need to ensure Outlook anywhere is configured on Outlook clients. Outlook will query the SCP and find the new Exchange 2013 server after redirection on Casarray. through the Autodiscover service. The only time it needs configuration is when you are not on the LAN or VPN.
Guy LidbetterAuthor Commented:
Hi Sunit, i think MAS is commenting on how Outlook will handle RPC/HTTP as opposed to the old RPC/TCP connections. As you mentioned from Outlook 2010 onward it should happen automatically.

As Exchange 2013 CAS is session-less and RPC end point is no longer used. RPC/TCP has been deprecated so essentially any connection to a 2013 CAS box is technically Outlook Anywhere. The same as setting up Outlook 2010 to use HTTP mode as its default.
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