In MailPro Windows it is not possible to configure the connection in an unsecured way, all communications with Momit servers are encrypted and secure. If, despite the purchase of the MailPro Windows service, you want to configure a device in the more traditional form with POP3 and IMAP, you can refer to the MailPro Linux guides, following the guidelines for configuring unencrypted connections.
By using unencrypted connections, however, many of the benefits offered by Microsoft Exchange for shared work and multiple synchronization of devices in which the account is configured are unavailable.