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Using CAS server for Exchange 2003 and Exchange 2007 mailboxes

Posted on 2009-04-03
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Last Modified: 2012-05-06
Hi Guys

I understand that the CAS can service mailboxes on both Exchange 2003 and Exchange 2007 mailboxes, whereas an Exchange 2003 FE can only service mailboxes on Exchange 2003.

However! If using the CAS, different URL's need to be use depending on what server the mailbox resides on...i.e, if the mailbox resides on a 2003 mailbox server, then /exchange must be used in the URL string, and if on 2007 then /owa.

Is there anyway to get to use the same URL regardless of whether the mailbox is on a 2003 *OR* 2007 server?
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Question by:kam_uk
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Expert Comment

by:Akhater
ID: 24065113
1) your 2007 CAS should NOT be a Mailbox server it should be CAS only or CAS/HUB
2) let all your users use the /exchange virtual directory and your CAS will take care of redirecting your 2007 users to /owa

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Author Comment

by:kam_uk
ID: 24067204
Hi there

Regarding #2, Ah, ok I didn't know that - so I can tell ALL my users to access via the /exchange URL and the CAS will forward those that are on 2007 mailbox servers to /OWA?
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Expert Comment

by:Akhater
ID: 24067580
yep exactly
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Assisted Solution

by:Akhater
Akhater earned 100 total points
ID: 24067605
btw it wld be better if you let ppl simply access http://webmail.domain.com & setup the redirection to /exchange on the CAS so when you finish the migration you change it to /OWA
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Author Comment

by:kam_uk
ID: 24067624
Hi

Hmmm, thanks...I'm not sure what you mean?

So, ALL users access http://webmail.domain.com - regardless of whether they are on 2007 or 2003 mailbox servers?

On the CAS I would set up redirection from http://webmail.domain.com to http://cas/exchange? Do you know how to do this? Is it via IIS redirection of some sort?

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Expert Comment

by:Akhater
ID: 24067690
are you windows 2003 or 2008 ?
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Author Comment

by:kam_uk
ID: 24067697
2008 mate
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Expert Comment

by:Akhater
ID: 24067756
well i'll retrieve that for you when i'm back home.
it's a IIS thingy
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by:Akhater
ID: 24069270
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Author Comment

by:kam_uk
ID: 24069338
Thanks...

But this doesn't redirect everything to https://owa.mycompany.com/owa?

Where it says to redirect, should I be entering https://owa.mycompany.com/exchange?

for example - to copy from Step1 b) of the post:

"b) Click on Respond with a 302 redirect and provide the absolute URL: https://owa.mycompany.com/owa"

Should this be:

"b) Click on Respond with a 302 redirect and provide the absolute URL: https://owa.mycompany.com/exchange"
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Expert Comment

by:Akhater
ID: 24069366
yea exactly change /owa thing to /exchange

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Author Comment

by:kam_uk
ID: 24069811
Hmm, thanks, ...doesn't seem to work, I get an HTTP Internal Server error?

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Expert Comment

by:Akhater
ID: 24070266
if you do type the /exchange it works?
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Author Comment

by:kam_uk
ID: 24071230
My mailbox is currently on a 2003 Mailbox server.

If I do /owa, then I get the message that my mailbox is located on a 2003 mailbox server and the CAS can't get to it, as I would expect.

If I do /exchange, then I get an HTTP 500 Internal server error.
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Expert Comment

by:Akhater
ID: 24071244
ok so it is not the redirection that failed

what is the exact error message, can you put a screen shot
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Author Comment

by:kam_uk
ID: 24071285
Sure...

To confirm - here are the settings I am using:

CAS server: cas.mydomain.com
CAS URL as specificed in Exchange Management Console: https://cas.mydomain.com/owa

I have amended the steps below to include exactly what I have typed:

>>>

Step 1:

1,Log on Interne Information Services (IIS) Manager

2, Switch back to Features view of the "Default Web Site" and double click on "Error Pages".

3, In the Actions pane, click on "Edit Feature Settings" and under "Error Responses", select: "Custom Error Pages". Then click OK

4, In the Actions pane, click on "Add" and configure the following

a) Status code: 403.4

b) Click on Respond with a 302 redirect and provide the absolute URL: https://cas.mydomain.com/exchange

 

Note: Make sure you are using "https"

 

Step 2:

1,Open IIS 7 Manager

2,Highlight the Default Website and ensure we are in the Features View

3, Double click on HTTP Redirect icon

4, Check the option "Redirect requests to this destination:" and type the absolute OWA URL: https://cas.mydomain.com/exchange

5, Under Redirect Behavior section, select the option "Only redirect requests to content in this directory (not subdirectories)"

6, From the drop down, select the Status code: Found (302)

7, Click Apply to save the settings

8, Run IISRESET /noforce command in CMD for the settings to take effect.

>>

I have set up a DNS entry pointing webmail.mydomain.com > cas.mydomain.com, but I get this error even if i use https://cas.mydomain.com/exchange

Thanks again for the excellent help on this one :)
CAS-error.docx
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Accepted Solution

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yoshi66 earned 400 total points
ID: 24101751
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Expert Comment

by:Akhater
ID: 24101865
on the CAS server

open EMC server config => client access


right click on the exchange virtual directory -> authentication tab

and make sure that you have "basic authentication" enabled
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Author Closing Comment

by:kam_uk
ID: 31566489
Thanks guys - Yoshi's link worked perfectly, but I'm awarding points to Akhater as well since he helped so much and I really appreciate it!
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