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Migrating Mailboxes from SBS 2008 to Office 365

My customer has a SBS 2008 Server and uses the built-in Exchange Server 2007. I migrated their mailboxes to Office 365 via a cutover migration. Now comes the impossible part. Their workstations are a mix of WIndows 7 and WIndows 10. Outlook on those workstations is a mix of 2010 and 2013.

   I can manually configure their Outlook to point to Office 365 but it will only stay for maybe 4 hours and reverts back to their Exchange Server. Simply opening Outlook and letting it sit it reverts back. I can tell when the Outlook 2010 workstations revert back because a pop-up asking for their email address and password keeps popping up. I can tell when the Outlook 2013 workstations revert back because they get a pop-up stating  "the microsoft exchange server administrator has made a change that requires you to quit and restart outlook". At that point Outlook has reverted back to pointing to their Exchange Server.

   I have tried stopping all the Microsoft Exchange services on their Exchange Server. Nothing I have tried works. I cannot keep Outlook pointed to Office 365. It keeps automatically reverting back. My guess is that I need to change the autodiscover services on the Exchange Server but that is just a guess. Does anyone know how to do this?
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That won't do it. The cutover migration does the same thing as exporting/importing the PST. When I do this I always delete and create a new profile pointing to Office 365. The problem.... after being open for about 4 hours Outlook reverts back to pointing to their Exchange Server.
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For anyone else who happens across this thread here is the definitive answer. The Exchange Server remains un-touched. You need to edit the registry on the workstations (user profiles). When this is done autodiscover will connect to Office 365 and not the local Exchange Server:

Outlook 2016 replace XX.X with 16.0
Outlook 2013 replace XX.X with 15.0
Outlook 2010 replace XX.X with 14.0

REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v PreferLocalXML                   /t REG_DWORD /d 00000000
REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v ExcludeLastKnownGoodURL          /t REG_DWORD /d 00000001
REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v ExcludeExplicitO365Endpoint      /t REG_DWORD /d 00000000
REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v ExcludeScpLookup                 /t REG_DWORD /d 00000001
REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v ExcludeHttpsRootDomain           /t REG_DWORD /d 00000001
REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v ExcludeHttpsAutodiscoverDomain   /t REG_DWORD /d 00000001
REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v ExcludeHttpRedirect              /t REG_DWORD /d 00000000
REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v ExcludeSrvRecord                 /t REG_DWORD /d 00000001
REG ADD HKCU\Software\Microsoft\Office\XX.X\Outlook\AutoDiscover /v ExcludeSrvLookup                 /t REG_DWORD /d 00000001