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Understand how you connect Outlook Web Access (OWA) with Exchange 2010
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Understand how you connect Outlook Web Access (OWA) with Exchange 2010
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Jun 24, 2019
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UNDERSTANDING THE CONNECTION
To understand the different redirection scenarios, it is important to understand the mechanisms that lie behind what happens when a user authenticates with a CAS to gain access to OWA Exchange 2010:
The user has access to the OWA URL through the web browser.
The user enters credentials.
CAS authenticates the user and retrieves the following information through the service detection request:
User's mailbox version
Location of the user's mailbox
(Active Directory site).
CAS collects additional information based on the information in the mailbox so that it can carry out the correct operation:
- If the mailbox is Exchange 2010 and local, CAS carries out the direct connection.
- If the mailbox is Exchange 2007 and local, CAS retrieves the ExternalURL from an Exchange 2007 CAS and redirects silently.
- If the mailbox is Exchange 2003, CAS retrieves Exchange2003URL and redirects silently.
- If the mailbox is not local, CAS retrieves the destination ExternalURL and redirects or authorizes if OWA's ExternalURL is not defined in the target
Active Directory
site.
TYPES OF OWA REDIRECTION
We will take as an example the redirection of an
Exchange 2010 SP1
, we have three types of redirection for OWA in the local product:
Manual redirection
Temporary manual redirection
Inherited silent redirection
We will give a brief explanation of these three types of
REDIRECTION:
Manual redirection
Manual redirection enables clients to not have to act as a funnel and proxy for all traffic from a central location when there are CASs that are closer to the user's mailbox.
Temporary manual redirection
In
Exchange 2010 SP1
, another type of redirection has been added for OWA, known as temporary manual redirection.
There are two scenarios where temporary manual redirection comes into play:
During a data center activation
SWITCHBACK
event, there is a possibility that the user's web browser still has the wrong DNS entry stored in the cache and thus pointing to the CAS infrastructure in the
Active Directory
site that already does not host the mailbox.
As a result, the CAS will issue a manual redirect to the correct
Active Directory
site, but the redirect is to the same URL that the user is currently using.
The second scenario is where CAS will issue the temporary manual redirection page when it detects that the local CAS site matches the
RPCCLIENTACCESSSERVER
value of the mailbox database, but the database is actually mounted in a different Active Directory site, so CAS issues a temporary redirect with the CAS ExternalURL in the site that hosts the mounted database.
Inherited silent redirection
For Outlook Web Access, Exchange 2010 CAS does not support the representation of mailbox data from legacy versions of Exchange.
With this we can say that we would already understand how to connect the OWA to an Exchange 2010
Ricardo Quagliano
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Jun 24, 2019
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