Difference between Autodiscover and a cas array?

What's the ultimate benefit of having a Client Access Array for Exchange 2010? Is that any different than just relying on auto-discover and/or having the OWA url used for Outlook clients and mobile devices?
garryshapeAsked:
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Carol ChisholmCommented:
Not sure I really understand ; using an array of servers will give you redundancy,
Autodiscover makes it easier to configure Outlook anywhere and activesync.
Simon Butler (Sembee)ConsultantCommented:
Asking the difference between a CAS array and Autodiscover is like asking the difference between a dog and a car. They are two completely separate systems.

The ultimate benefit of a CAS Array is that it allows you to control where the clients connect to. That could be a load balancer or a number of CAS role servers.
Without a CAS Array, you have no way of moving clients to use another server. Autodiscover would only do it IF the old server goes away completely. As such it cannot be tested.

Why not create a CAS Array? It takes all of three minutes as it is a DNS record and a modification to the database configuration. It has zero impact on the clients, but can save you from doing a LOT of work.
http:/semb.ee/casarray

Simon.

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garryshapeAuthor Commented:
Ok thanks I was having trouble recalling that
Unfortunately environment did not create a CAS Array so nice handful of 300 computers or so were all setup with Profiles pointing to specific mail server.
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garryshapeAuthor Commented:
I think if I migrate them to a new database that is tied to the cas array then it may update their Outlook clients I cannot recall
Simon Butler (Sembee)ConsultantCommented:
The only way that clients will update is if you move them to a database on a server in another AD site. Same site moves do not trigger the update.

When it hasn't been implemented there are a number of methods you can use.
Sending out an email asking users to repair their profile will get quite a few moved.
Asking helpdesk to do it whenever they visit a workstation (for any reason) can also pick up a lot more. No way of knowing who is missing of course.

Simon.
garryshapeAuthor Commented:
Got it. Thanks as always. Looking forward to this task.
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