Turn off Outlook autoconfigure

I have an SBS 2011 server that currently is NOT HOSTING E-MAIL.  E-mail currently hosted in the cloud at INTERMEDIA.  I've disabled all the Exchange services on my SBS and everything is fine.    

In preparation for bringing mail in house, I want to bring Exchange on-line with a DUMMY domain and start hosting my fax server. (I'll forward the faxes to the real e-mail addresses- using the dummy domain)

Question is, once I bring Exchange up-- it starts to auto-configure clients on the network.  I DON'T WANT TO DO THIS until I am ready to migrate off the external host.  

With SBS, can I enable Exchange in this manner WITHOUT effecting CLIENT PC's and specifically their Outlook configuration.  
mwinickAsked:
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jrhelgesonCommented:
You do realize that this goes against every question I have ever answered on this forum?  How to properly break exchange?

Well, I would start by pointing autodiscover for your domain out to the hosted exchange server.
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mwinickAuthor Commented:
Yes, I know-- but I have a good business case for getting the Exchange server up and running PRIOR TO the migration back to in-house e-mail hosting.  Besides, lots of things don't work in the SBS Wizards with Exchange services disabled.  

I know its more complicated than an autodiscover DNS record, especially for internal logged on domain users.  
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jrhelgesonCommented:
You're right, it is more complicated, however, that is the place to start - is getting autodiscover working with the outside exchange server.

Then try disabling the IIS web service, as that is how autoconfigure takes place.

See where that gets you.
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mwinickAuthor Commented:
Hmm, your suggestion would disable OWA, sharepoint, etc... which would be ok until I actually do the migration and have active mailboxes on the server.  But I wonder if it might be possible to just reconfigure the Exchange SBS autodiscover services (in IIS or whervever else it lives) to point to the external host (Intermedia) for e-mail.  

That way, PC's on the internal domain running Outlook won't be affected and I could still leave IIS running.  And then, when I migrate the mail back in house, I would put the autodiscover back to SBS defaults.  
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jrhelgesonCommented:
You don't need to disable all of IIS, just stop the website that supports the Outlook Autodiscover.

There are two parts we are dealing with here: Autodiscover, and Active Directory - I'm hoping that we can fix this (or break it, rather) using autodiscover & IIS, rather than breaking it within Active Directory.

Perhaps if you were to delete everyone's mailbox from the server - and re-create them once they are ready to move back over?
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mwinickAuthor Commented:
Thx for your fast reply!  Let me try that off hours and I'll report back.  Thx.  
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mwinickAuthor Commented:
I haven't fixed this yet-- still have my exchange services disabled.     But eventually I'll look into changing the autodiscover iis-- because it DOES clearly try to reconfigure outlook clients the way it is now.  Thx.
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mwinickAuthor Commented:
thx
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