There are three type of Windstream email settings iPhone and those are explained in detail below:
Messages are stored on the Windstream server using IMAP (Internet Messaging Access Protocol). All IMAP-enabled devices will have the same look and feel; whether a message is deleted or a folder is created on one device or our webmail, the change will be reflected on all devices instantaneously. This is the best form of incoming server, especially if you have numerous devices checking the same email address.
POP (Post Office Protocol) - Messages are downloaded to a single device and then erased from the Windstream server. When you check your mail from a different computer or device, it may look that mail is missing or vanishing from your Inbox, which can be troublesome.