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This has been asked many times... but the export button in the screenshots is missing. I just upgraded to V5.0 with hopes that this feature would appear but no dice. There is nothing visible to the right of the "not opened" count for sent campaigns. Has this feature been removed for some reason?
The 'Unopens' export option is only available in the very last campaign that was sent instead of in all campaigns in order not to skew the exported results. I suggest exporting unopens if you need to before sending the next campaign.
A good alternative way to send another campaign to 'unopens' of any sent campaign is to import subscribers who ‘opened’ the campaign into a new list from the campaign report:
Then exclude this list when you send your campaign using the ‘Exclude list’ feature. Emails will be sent only to subscribers who didn't open.