Take a look at this thread --
http://forum.ppcgeeks.com/showthread.php?t=22628 - lots of good discussion around this very topic.
Quote:
Originally Posted by nosmohtac
Having the same problem restoring messages....How do you turn threaded messaging off/on?
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Here is the regedit to turn threaded on/off ->
HKCU\Software\Microsoft\Inbox\Settings\OEM\
New DWORD = "SMSInboxThreadingDisabled"
DWORD Value = "1"