Step 2 Create the Saved Search
After you've completed Step 1, you can create a saved search to find lead records created more than three days ago with the Lost Lead Email Sent field equal to false.
To create the saved search:
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              Go to Lists > Search > Saved Searches > New. 
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              On the New Saved Search page, click Customer. 
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              In the Search Title field, enter Lost Lead Email Search. 
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              On the Criteria tab, enter the following filter criteria in the Filter field: Filter Criteria Date Created before and 3 days ago Stage any of and Lead Lost Lead Email Sent (Custom) No   
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              Click Save. 
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              Continue to Step 3 Create the Workflow and Set the Schedule.