Connect to Exchange 2003 mailbox through Exchange 2010 CAS

Posted on 2010-01-05
Last Modified: 2012-05-08
Existing Setup:
-2008 DC/GC
-Exchange 2003 Back End
-Exchange 2003 Front End
-all mailboxes reside on Ex2003

Existing setup works fine.  OWA, RPC over HTTPS, the whole boat.

I'm trying to introduce Exchange 2010 CAS as my first step to deploy Ex2010.

I got OWA working for 2003 mailboxes.  I had to configure the "legacy" url, and when I login to 2010 OWA it auto redirects the browser, and logs me into the my existing 2003 front end OWA server.  That works fine.

Also, when i create an outlook profile, if i put in the name of my 2010 CAS server (instead of my 2003 back end server where the mailbox resides) it automatically replaces it with the 2003 back end server.  that tells me that a direct mapi connection is also working fine, as the CAS is doing its job, and inserting the correct mailbox server for the legacy 2003 mailbox.

What doesn't seem to work at all, is RPC over HTTPS (now called outlook anywhere).

I have installed the Windows RPC over HTTP Proxy component.

I have run through the Outlook Anywhere wizard and set my URL.

Exchange 2003 back end server already configured and working for rpc/https.

I also verified that the correct ports were specified in the registry, just because i'm paranoid, the outlook anywhere wizard did set them correctly.  all good there.

I have not installed an SSL Cert because this is a lab environment.  In Lieu of having a cert, i just turned off "require SSL" on the Default Web Site on my 2010 CAS server, and did the same in my Outlook profile.

Outlook 2003 will not connect to the Exchange 2003 mailbox via Outlook Anywhere.  Nothing I seem to do works.

I wonder if that SSL cert is mandatory??  I see that Exchange 2010 installs a self signed cert by default.  can i use that cert in my testing?  I see that i can export it to a file.  But where would i import that cert to?  my WinXp client with Outlook?  my exchange 2003 servers??

Based on this article:

I wonder how important that cert is.

Any help would be greatly appreciated, I'm banging my head against the wall trying to get this to work.
Question by:Vjz1
    LVL 24

    Expert Comment

    Outlook anywhere only works on port 443 and hence a trusted certificate is necessary.

    Install the cert on the XP machine and try running Outlook anywhere.

    Author Comment

    What exactly do you mean?  export the self signed cert and install it on my xp machine?  do i just install it through the IE control panel like any other cert?


    Author Comment

    ok i went to my HTTPS://CAS/OWA and installed the cert from there.

    i now don't get prompt when i go back to the OWA page.  so the cert seems to be installed ok.

    I can also see it in the IE control panel.

    However, Outlook Anywhere still doesn't connect.  Nothing in the application log on my CAS server either.


    Accepted Solution

    i figured it out.  i had to install a real cert, you can't use the self signed cert for OA.

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