Why does Outlook Instant Search stop searching on May 8th?

Outlook 2007 Instant Search will only search up to May 8th on my customer's machine.  I have uninstalled Windows Desktop Search and reinstalled and still only searches up to May 8th.   Any ideas?
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Its likely that was the last time Outlook used Cached Exchange Mode

Go to Tools>Account Settings>
Open the Account Details
Under Exchange Server, make sure "Use cached exchange mode, is on

Close and reopen Outlook

Expand all folders in Outlook

GO to Start>Control Panel>indexing Options>Advanced> and Rebuild the index

Then try again

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