Applies to the error:
If Outlook is not searching all of your email correctly, you can rebuild the Outlook search index to fix this:
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Click on File then Options
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Select Search on the left then click Indexing Options
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Click Advanced
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Click the Rebuild button
This will cause Outlook to rebuild its entire search index. This can take a long time to complete but you can continue to use Outlook and it will do this in the background.