Exchange 2013 ActiveSync with Exchange 2010 front end

We have just installed an Exchange 2013 server and created a test mailbox on it.  Mail flows properly between the new 2013 server and our existing 2010 server.

We have the 2010 server as our OWA, OutlookAnywhere and ActiveSync server.

Can the 2010 server act as a front-end for ActiveSync, OWA & OutlookAnywhere for the 2013 server?  So far it's not working (the Microsoft Remote Connectivity Analyzer web site says 403 Access Denied when testing ActiveSync with the test mailbox).

If this can be done, how is it done?
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shawnsouthernAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
No.
You need to use Exchange 2013 as the primary connection method and let Exchange downgrade proxy or redirect as required.

That is the process outlined in the documentation for migration as well.

Simon.
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shawnsouthernAuthor Commented:
Here's the result from Microsoft's analyzer:

An HTTP 403 forbidden response was received. The response appears to have come from IIS7. Body of the response: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
<title>403 - Forbidden: Access is denied.</title>
<style type="text/css">
<!--
body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;}
fieldset{padding:0 15px 10px 15px;}
h1{font-size:2.4em;margin:0;color:#FFF;}
h2{font-size:1.7em;margin:0;color:#CC0000;}
h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;}
#header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS", Verdana, sans-serif;color:#FFF;
background-color:#555555;}
#content{margin:0 0 0 2%;position:relative;}
.content-container{background:#FFF;width:96%;margin-top:8px;padding:10px;position:relative;}
-->
</style>
</head>
<body>
<div id="header"><h1>Server Error</h1></div>
<div id="content">
<div class="content-container"><fieldset>
<h2>403 - Forbidden: Access is denied.</h2>
<h3>You do not have permission to view this directory or page using the credentials that you supplied.</h3>
</fieldset></div>
</div>
</body>
</html>

Headers received:
Content-Length: 1233
Cache-Control: private
Content-Type: text/html
Date: Fri, 13 Dec 2013 14:45:47 GMT
Server: Microsoft-IIS/7.5
X-AspNet-Version: 2.0.50727
X-Powered-By: ASP.NET
Elapsed Time: 20195 ms.
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shawnsouthernAuthor Commented:
Thanks... that's what I thought, but I wanted to be sure it couldn't be done.  I was hoping to do it this way instead as it would be less disruptive.
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Simon Butler (Sembee)ConsultantCommented:
Why would it be disruptive? Done correctly it can be done with zero disruption.

Simon.
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