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Kindly provide the solution as the earliest , awaiting for your response.
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You can change the MX records for your current CAS array to point to the new CAS array, that should get it to work.
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Hi Alex ,<br />
<br />
&nbsp;Thanks for your feedback , we dont have CAS array in our environment .<br />
We are using &nbsp;two stand alone CAS server .
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the CAS server is what I meant
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i will check and get back to u soon
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In Site A we have one CAS server that is internet facing <br />
<br />
both internal and external urls are mail.exchange.com<br />
<br />
now i have to take this server down and i want to point all the connections to another CAS server in site B.<br />
<br />
The CAS server in Site B is not internet facing, internal url for this CAS is servername.exchange.com, no external url is present.<br />
<br />
here are my questions.<br />
1. how make the CAS server in Site B as internet facing.<br />
2. how to change DNS records so that all connections will point to SiteB CAS server.<br />
3. Do i need change only internal DNS records or External DNS records.
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In Site A we have one CAS server that is internet facing 

both internal and external urls are mail.exchange.com

now i have to take this server down and i want to point all the connections to another CAS server in site B.

The CAS server in Site B is not internet facing, internal url for this CAS is servername.exchange.com, no external url is present.

here are my questions.
1. how make the CAS server in Site B as internet facing.
2. how to change DNS records so that all connections will point to SiteB CAS server.
3. Do i need change only internal DNS records or External DNS records.

Switch over of CAS server

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.