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Thanks for posting. You don't need to delete the unsubscribes from the account because Constant Contact actually removed them for you as they opt out. They are kept in your Unsubscribed list as a record but Constant Contact will prevent you from re-importing.
If you do want to delete them from the Unsubscribed list you can do so by clicking into this list and selecting the contacts. There is a delete button available under More Actions.
Please note, if you delete them from the Unsubscribe list you will have no record of the contacts in the account.
Thanks, Hannah. The information you sent is certainly an accepted solution ... I just couldn't find the place to tag that!