Disable and Update DNS/ Group Policy for Exchange in SBS 2008 to move to 365

I have a 2008 SBS Server that was running exchange for mail services to the business. We have purchased office 365 and moved everything to 365, however I have an issue with all the client systems still trying to automatically configure Outlook for use with the local exchange server we have discontinued. The only way I can get them to connect is to change DNS on the machine to google dns for example, restart the computer, setup outlook in 365, then change dns back... But even so there are glitches and some computer keep asking for the passwords. I have disabled all the exchange services on the server, but it seems like there are some additional things I need to do to clean up Group Policy and DNS. Does anyone have a checklist for this or experience in doing so?
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tc6atimAsked:
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Cliff GaliherCommented:
Time to migrate off of SBS 2008. The short answer is you need to uninstall Exchange 2007. Clients use autodiscover to find the server, and the *first* method autodiscover uses is not DNS, but is actually active directory. It looks for a "service connection point" (SCP) which exists in AD where exchange servers are installed. Uninstalling Exchange 2007 solves this problem.

However uninstalling Exchange 2007 on SBS introduces other problems. Most notably, SBS was designed as an integrated suite. So updates are not tested against an SBS box without Exchange, and breaks can (and have) occurred. And since it is an unsupported configuration, MS won't try to fix the issues that come up. Many of the wizards won't work since they will try to configure exchange (such as adding a user tries to create an exchange mailbox.)

So the realistic solution is short-term, uninstall Exchange to ease the immediate issues. And medium-term, plan on moving off of SBS onto a standard/datacenter/essentials/foundation server. Without exchange, SBS is just not a good fit. The CALs are more expensive. The integration is broken even when you don't uninstall Exchange, and things just don't work as they should (as you are discovering) because you are no longer using the product as the suite it was intended to be.

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tc6atimAuthor Commented:
Thank you, I agree with getting them off SBS, but they have not moved forward with that quote and I am looking for a short-term fix until I can get them to move forward. I will leave this question open for the rest of the day and then close out.

I guess I just need to research uninstalling Exchange from SBS, I tried earlier, but received messages about not being able to delete if there are any mailboxes. Do I just need to go through and delete all mailboxes? Something about a shared address book too in the public storage box.
Cliff GaliherCommented:
Correct. You'll have to move or delete all data from Exchange before it will uninstall.
James NewportCommented:
Ok heres what I did to disable auto discover
Open EMS
Run the following cmdlet Get-ClientAccessServer
Set-ClientAccessServer -Identity "CASxx" -AutoDiscoverServiceInternalUri $NULL

Where "CASxx" is the name of the CAS server that was discovered in step 2
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