Good news! We’ve enhanced our import process to store a history of all imports, as well as the particular new or updated prospects included in that import. This makes tasks like going back to a previous import to tag, segment, or filter those prospects much easier.
The import log lives on the first page of the Import Wizard, and can be filtered to show only your imports, or imports by any user:
Additionally, you can drill in to each past import and filter the prospects based on whether they were created or updated (because they already existed) during the import:
Last but not least, the import notification email has been enhanced to link directly to this report.
Note: This feature is not retroactive and began tracking import history beginning July 23, 2012.