We've redesigned the upload page, and have added some additional feature to the upload engine making it much more powerful. It is now possible to enrich your existing lead-data by uploading data directly from a spreadsheet.
As previously you start off by selecting which columns that should be used for 'matching' your existing data against the import-data (this may be an internal key or a phone number). But now you may also specify columns containing data that should be added to existing leads when a match is found.
Additionally, you can specify that leads for which no match can be found should be deactivated from the upload pool. This is useful for making a lead-pool 1 to 1 with an external source.