Improvement
The Lead Importer can now update your existing leads during import, filling in missing fields and ignoring existing ones. It can also match leads by Lead ID, making it easier to update exactly the leads you want.
In addition to the improved import features, leads created or updated by the importer can now be searched separately using the import*created:IMPORT*ID and import*updated:IMPORT*ID search terms. Those searches can be run with a click from the import summary. When you visit the lead page for a lead that was updated by an import, you'll now see an "import updated" activity.
