The good news is you can upload contacts from the various platforms they are now being held in! Contacts can be moved over from Outlook whether it be done manually, or through our Outlook plugin. If they are being held in any other platform, I would suggest taking a look at our Apps and Integration Marketplace. This Marketplace is where you can find 3rd party plugins that integrate with Constant Contact. If your platform is not listed in our marketplace, the next best step is to export these contacts from their platform into an excel sheet. You can then upload this excel sheet directly into your account.